diff --git a/novelwriter/formats/shared.py b/novelwriter/formats/shared.py
index 82a7c2c4..0c8fb701 100644
--- a/novelwriter/formats/shared.py
+++ b/novelwriter/formats/shared.py
@@ -29,6 +29,8 @@ import re
 
 from enum import Flag, IntEnum
 
+from PyQt5.QtGui import QColor
+
 ESCAPES = {r"\*": "*", r"\~": "~", r"\_": "_", r"\[": "[", r"\]": "]", r"\ ": ""}
 RX_ESC = re.compile("|".join([re.escape(k) for k in ESCAPES.keys()]), flags=re.DOTALL)
 
@@ -40,6 +42,23 @@ def stripEscape(text: str) -> str:
     return text
 
 
+class TextDocumentTheme:
+    """Default document theme."""
+
+    text:      QColor = QColor(0, 0, 0)
+    highlight: QColor = QColor(255, 255, 166)
+    head:      QColor = QColor(66, 113, 174)
+    comment:   QColor = QColor(100, 100, 100)
+    note:      QColor = QColor(129, 55, 9)
+    code:      QColor = QColor(66, 113, 174)
+    modifier:  QColor = QColor(129, 55, 9)
+    keyword:   QColor = QColor(245, 135, 31)
+    tag:       QColor = QColor(66, 113, 174)
+    optional:  QColor = QColor(66, 113, 174)
+    dialog:    QColor = QColor(66, 113, 174)
+    altdialog: QColor = QColor(129, 55, 9)
+
+
 # Enums
 # =====
 
diff --git a/novelwriter/formats/todocx.py b/novelwriter/formats/todocx.py
index 1b5a0c80..e5b4c0a6 100644
--- a/novelwriter/formats/todocx.py
+++ b/novelwriter/formats/todocx.py
@@ -34,6 +34,7 @@ from typing import NamedTuple
 from zipfile import ZIP_DEFLATED, ZipFile
 
 from PyQt5.QtCore import QMarginsF, QSizeF
+from PyQt5.QtGui import QColor
 
 from novelwriter import __version__
 from novelwriter.common import firstFloat, xmlSubElem
@@ -41,6 +42,7 @@ from novelwriter.constants import nwHeadFmt, nwKeyWords, nwLabels, nwStyles
 from novelwriter.core.project import NWProject
 from novelwriter.formats.shared import BlockFmt, BlockTyp, T_Formats, TextFmt
 from novelwriter.formats.tokenizer import Tokenizer
+from novelwriter.types import QtHexRgb
 
 logger = logging.getLogger(__name__)
 
@@ -80,6 +82,11 @@ def _mkTag(ns: str, tag: str) -> str:
     return tag
 
 
+def _docXCol(color: QColor) -> str:
+    """Format a QColor as the DocX accepted value."""
+    return color.name(QtHexRgb).lstrip("#")
+
+
 # Formatting Codes
 X_BLD = 0x001  # Bold format
 X_ITA = 0x002  # Italic format
@@ -115,8 +122,6 @@ S_HEAD  = "Header"
 S_FNOTE = "FootnoteText"
 
 # Colours
-COL_HEAD_L12 = "2a6099"
-COL_HEAD_L34 = "444444"
 COL_DIALOG_M = "2a6099"
 COL_DIALOG_A = "813709"
 COL_META_TXT = "813709"
@@ -535,7 +540,7 @@ class ToDocX(Tokenizer):
         styles: list[DocXParStyle] = []
 
         hScale = self._scaleHeads
-        hColor = self._colorHeads
+        hColor = _docXCol(self._theme.head) if self._colorHeads else None
         fSz = self._fontSize
         fnSz = 0.8 * self._fontSize
         fSz0 = (nwStyles.H_SIZES[0] * fSz) if hScale else fSz
@@ -582,7 +587,7 @@ class ToDocX(Tokenizer):
             after=fSz * self._marginHead1[1],
             line=fSz1 * self._lineHeight,
             level=0,
-            color=COL_HEAD_L12 if hColor else None,
+            color=hColor,
             bold=self._boldHeads,
         ))
 
@@ -597,7 +602,7 @@ class ToDocX(Tokenizer):
             after=fSz * self._marginHead2[1],
             line=fSz2 * self._lineHeight,
             level=1,
-            color=COL_HEAD_L12 if hColor else None,
+            color=hColor,
             bold=self._boldHeads,
         ))
 
@@ -612,7 +617,7 @@ class ToDocX(Tokenizer):
             after=fSz * self._marginHead3[1],
             line=fSz3 * self._lineHeight,
             level=1,
-            color=COL_HEAD_L34 if hColor else None,
+            color=hColor,
             bold=self._boldHeads,
         ))
 
@@ -627,7 +632,7 @@ class ToDocX(Tokenizer):
             after=fSz * self._marginHead4[1],
             line=fSz4 * self._lineHeight,
             level=1,
-            color=COL_HEAD_L34 if hColor else None,
+            color=hColor,
             bold=self._boldHeads,
         ))
 
diff --git a/novelwriter/formats/tohtml.py b/novelwriter/formats/tohtml.py
index 41449fc3..b00a95b8 100644
--- a/novelwriter/formats/tohtml.py
+++ b/novelwriter/formats/tohtml.py
@@ -34,7 +34,7 @@ from novelwriter.constants import nwHeadFmt, nwHtmlUnicode, nwKeyWords, nwLabels
 from novelwriter.core.project import NWProject
 from novelwriter.formats.shared import BlockFmt, BlockTyp, T_Formats, TextFmt, stripEscape
 from novelwriter.formats.tokenizer import Tokenizer
-from novelwriter.types import FONT_STYLE, FONT_WEIGHTS
+from novelwriter.types import FONT_STYLE, FONT_WEIGHTS, QtHexRgb
 
 logger = logging.getLogger(__name__)
 
@@ -354,16 +354,18 @@ class ToHtml(Tokenizer):
             return []
 
         mScale = self._lineHeight/1.15
+        tColor = self._theme.text.name(QtHexRgb)
+        hColor = self._theme.head.name(QtHexRgb) if self._colorHeads else tColor
 
         styles = []
         font = self._textFont
         styles.append((
             "body {{"
-            "font-family: '{0:s}'; font-size: {1:d}pt; "
-            "font-weight: {2:d}; font-style: {3:s};"
+            "color: {0:s}; font-family: '{1:s}'; font-size: {2:d}pt; "
+            "font-weight: {3:d}; font-style: {4:s};"
             "}}"
         ).format(
-            font.family(), font.pointSize(),
+            tColor, font.family(), font.pointSize(),
             FONT_WEIGHTS.get(font.weight(), 400),
             FONT_STYLE.get(font.style(), "normal"),
         ))
@@ -380,43 +382,43 @@ class ToHtml(Tokenizer):
         ))
         styles.append((
             "h1 {{"
-            "color: rgb(66, 113, 174); "
+            "color: {0:s}; "
             "page-break-after: avoid; "
-            "margin-top: {0:.2f}em; "
-            "margin-bottom: {1:.2f}em;"
+            "margin-top: {1:.2f}em; "
+            "margin-bottom: {2:.2f}em;"
             "}}"
         ).format(
-            mScale * self._marginHead1[0], mScale * self._marginHead1[1]
+            hColor, mScale * self._marginHead1[0], mScale * self._marginHead1[1]
         ))
         styles.append((
             "h2 {{"
-            "color: rgb(66, 113, 174); "
+            "color: {0:s}; "
             "page-break-after: avoid; "
-            "margin-top: {0:.2f}em; "
-            "margin-bottom: {1:.2f}em;"
+            "margin-top: {1:.2f}em; "
+            "margin-bottom: {2:.2f}em;"
             "}}"
         ).format(
-            mScale * self._marginHead2[0], mScale * self._marginHead2[1]
+            hColor, mScale * self._marginHead2[0], mScale * self._marginHead2[1]
         ))
         styles.append((
             "h3 {{"
-            "color: rgb(50, 50, 50); "
+            "color: {0:s}; "
             "page-break-after: avoid; "
-            "margin-top: {0:.2f}em; "
-            "margin-bottom: {1:.2f}em;"
+            "margin-top: {1:.2f}em; "
+            "margin-bottom: {2:.2f}em;"
             "}}"
         ).format(
-            mScale * self._marginHead3[0], mScale * self._marginHead3[1]
+            hColor, mScale * self._marginHead3[0], mScale * self._marginHead3[1]
         ))
         styles.append((
             "h4 {{"
-            "color: rgb(50, 50, 50); "
+            "color: {0:s}; "
             "page-break-after: avoid; "
-            "margin-top: {0:.2f}em; "
-            "margin-bottom: {1:.2f}em;"
+            "margin-top: {1:.2f}em; "
+            "margin-bottom: {2:.2f}em;"
             "}}"
         ).format(
-            mScale * self._marginHead4[0], mScale * self._marginHead4[1]
+            hColor, mScale * self._marginHead4[0], mScale * self._marginHead4[1]
         ))
         styles.append((
             ".title {{"
diff --git a/novelwriter/formats/tokenizer.py b/novelwriter/formats/tokenizer.py
index 7dd0a1f8..74f271b5 100644
--- a/novelwriter/formats/tokenizer.py
+++ b/novelwriter/formats/tokenizer.py
@@ -44,7 +44,9 @@ from novelwriter.constants import (
 from novelwriter.core.index import processComment
 from novelwriter.core.project import NWProject
 from novelwriter.enum import nwComment, nwItemLayout
-from novelwriter.formats.shared import BlockFmt, BlockTyp, T_Block, T_Formats, T_Note, TextFmt
+from novelwriter.formats.shared import (
+    BlockFmt, BlockTyp, T_Block, T_Formats, T_Note, TextDocumentTheme, TextFmt
+)
 from novelwriter.text.patterns import REGEX_PATTERNS
 
 logger = logging.getLogger(__name__)
@@ -110,6 +112,9 @@ class Tokenizer(ABC):
         self._keepBreaks   = True    # Keep line breaks in paragraphs
         self._defaultAlign = "left"  # The default text alignment
 
+        # Other Setting
+        self._theme = TextDocumentTheme()
+
         # Margins
         self._marginTitle = nwStyles.T_MARGIN["H0"]
         self._marginHead1 = nwStyles.T_MARGIN["H1"]
@@ -218,6 +223,11 @@ class Tokenizer(ABC):
     #  Setters
     ##
 
+    def setTheme(self, theme: TextDocumentTheme) -> None:
+        """Set the document colour theme."""
+        self._theme = theme
+        return
+
     def setPartitionFormat(self, hFormat: str, hide: bool = False) -> None:
         """Set the partition format pattern."""
         self._fmtPart = hFormat.strip()
diff --git a/novelwriter/formats/toodt.py b/novelwriter/formats/toodt.py
index d5bde589..9f680814 100644
--- a/novelwriter/formats/toodt.py
+++ b/novelwriter/formats/toodt.py
@@ -35,7 +35,7 @@ from hashlib import sha256
 from pathlib import Path
 from zipfile import ZIP_DEFLATED, ZipFile
 
-from PyQt5.QtGui import QFont
+from PyQt5.QtGui import QColor, QFont
 
 from novelwriter import __version__
 from novelwriter.common import xmlIndent, xmlSubElem
@@ -220,10 +220,6 @@ class ToOdt(Tokenizer):
         self._mDocRight  = "2.000cm"
 
         # Colour
-        self._colHead12  = None
-        self._opaHead12  = None
-        self._colHead34  = None
-        self._opaHead34  = None
         self._colDialogM = "#2a6099"
         self._colDialogA = "#813709"
         self._colMetaTx  = "#813709"
@@ -318,12 +314,6 @@ class ToOdt(Tokenizer):
         self._mLeftFoot = self._emToCm(self._marginFoot[0])
         self._mBotFoot  = self._emToCm(self._marginFoot[1])
 
-        if self._colorHeads:
-            self._colHead12 = "#2a6099"
-            self._opaHead12 = "100%"
-            self._colHead34 = "#444444"
-            self._opaHead34 = "100%"
-
         self._fLineHeight  = f"{round(100 * self._lineHeight):d}%"
         self._fBlockIndent = self._emToCm(self._blockIndent)
         self._fTextIndent  = self._emToCm(self._firstWidth)
@@ -894,6 +884,8 @@ class ToOdt(Tokenizer):
 
     def _useableStyles(self) -> None:
         """Set the usable styles."""
+        hColor = self._theme.head if self._colorHeads else None
+
         # Add Text Body Style
         style = ODTParagraphStyle(S_TEXT)
         style.setDisplayName("Text body")
@@ -931,8 +923,7 @@ class ToOdt(Tokenizer):
         style.setFontFamily(self._fontFamily)
         style.setFontSize(self._fSizeText)
         style.setFontWeight(self._fontWeight)
-        style.setColour(self._colMetaTx)
-        style.setOpacity(self._opaMetaTx)
+        style.setColour(self._theme.note)
         style.packXML(self._xStyl)
         self._mainPara[style.name] = style
 
@@ -982,8 +973,7 @@ class ToOdt(Tokenizer):
         style.setFontFamily(self._fontFamily)
         style.setFontSize(self._fSizeHead1)
         style.setFontWeight(self._headWeight)
-        style.setColour(self._colHead12)
-        style.setOpacity(self._opaHead12)
+        style.setColour(hColor)
         style.packXML(self._xStyl)
         self._mainPara[style.name] = style
 
@@ -1000,8 +990,7 @@ class ToOdt(Tokenizer):
         style.setFontFamily(self._fontFamily)
         style.setFontSize(self._fSizeHead2)
         style.setFontWeight(self._headWeight)
-        style.setColour(self._colHead12)
-        style.setOpacity(self._opaHead12)
+        style.setColour(hColor)
         style.packXML(self._xStyl)
         self._mainPara[style.name] = style
 
@@ -1018,8 +1007,7 @@ class ToOdt(Tokenizer):
         style.setFontFamily(self._fontFamily)
         style.setFontSize(self._fSizeHead3)
         style.setFontWeight(self._headWeight)
-        style.setColour(self._colHead34)
-        style.setOpacity(self._opaHead34)
+        style.setColour(hColor)
         style.packXML(self._xStyl)
         self._mainPara[style.name] = style
 
@@ -1036,8 +1024,7 @@ class ToOdt(Tokenizer):
         style.setFontFamily(self._fontFamily)
         style.setFontSize(self._fSizeHead4)
         style.setFontWeight(self._headWeight)
-        style.setColour(self._colHead34)
-        style.setOpacity(self._opaHead34)
+        style.setColour(hColor)
         style.packXML(self._xStyl)
         self._mainPara[style.name] = style
 
@@ -1298,14 +1285,14 @@ class ODTParagraphStyle:
             self._tAttr["font-weight"][1] = None
         return
 
-    def setColour(self, value: str | None) -> None:
+    def setColour(self, value: QColor | None) -> None:
         """Set text colour."""
-        self._tAttr["color"][1] = value
-        return
-
-    def setOpacity(self, value: str | None) -> None:
-        """Set text opacity."""
-        self._tAttr["opacity"][1] = value
+        if isinstance(value, QColor):
+            self._tAttr["color"][1] = value.name(QColor.NameFormat.HexRgb)
+            self._tAttr["opacity"][1] = f"{int(100.0 * value.alphaF())}%"
+        else:
+            self._tAttr["color"][1] = None
+            self._tAttr["opacity"][1] = None
         return
 
     ##
diff --git a/novelwriter/formats/toqdoc.py b/novelwriter/formats/toqdoc.py
index 243059ed..1a48a562 100644
--- a/novelwriter/formats/toqdoc.py
+++ b/novelwriter/formats/toqdoc.py
@@ -29,7 +29,7 @@ from pathlib import Path
 
 from PyQt5.QtCore import QMarginsF, QSizeF
 from PyQt5.QtGui import (
-    QColor, QFont, QFontMetricsF, QPageSize, QTextBlockFormat, QTextCharFormat,
+    QFont, QFontMetricsF, QPageSize, QTextBlockFormat, QTextCharFormat,
     QTextCursor, QTextDocument
 )
 from PyQt5.QtPrintSupport import QPrinter
@@ -49,21 +49,6 @@ logger = logging.getLogger(__name__)
 T_TextStyle = tuple[QTextBlockFormat, QTextCharFormat]
 
 
-class TextDocumentTheme:
-    text:      QColor = QColor(0, 0, 0)
-    highlight: QColor = QColor(255, 255, 166)
-    head:      QColor = QColor(66, 113, 174)
-    comment:   QColor = QColor(100, 100, 100)
-    note:      QColor = QColor(129, 55, 9)
-    code:      QColor = QColor(66, 113, 174)
-    modifier:  QColor = QColor(129, 55, 9)
-    keyword:   QColor = QColor(245, 135, 31)
-    tag:       QColor = QColor(66, 113, 174)
-    optional:  QColor = QColor(66, 113, 174)
-    dialog:    QColor = QColor(66, 113, 174)
-    altdialog: QColor = QColor(129, 55, 9)
-
-
 def newBlock(cursor: QTextCursor, bFmt: QTextBlockFormat) -> None:
     if cursor.position() > 0:
         cursor.insertBlock(bFmt)
@@ -84,7 +69,6 @@ class ToQTextDocument(Tokenizer):
         self._document.setUndoRedoEnabled(False)
         self._document.setDocumentMargin(0)
 
-        self._theme = TextDocumentTheme()
         self._styles: dict[int, T_TextStyle] = {}
         self._usedNotes: dict[str, int] = {}
 
@@ -110,11 +94,6 @@ class ToQTextDocument(Tokenizer):
     #  Setters
     ##
 
-    def setTheme(self, theme: TextDocumentTheme) -> None:
-        """Set the document colour theme."""
-        self._theme = theme
-        return
-
     def setPageLayout(
         self, width: float, height: float, top: float, bottom: float, left: float, right: float
     ) -> None:
diff --git a/novelwriter/gui/docviewer.py b/novelwriter/gui/docviewer.py
index c2a75479..5b296fa8 100644
--- a/novelwriter/gui/docviewer.py
+++ b/novelwriter/gui/docviewer.py
@@ -44,7 +44,8 @@ from novelwriter.error import logException
 from novelwriter.extensions.configlayout import NColourLabel
 from novelwriter.extensions.eventfilters import WheelEventFilter
 from novelwriter.extensions.modified import NIconToolButton
-from novelwriter.formats.toqdoc import TextDocumentTheme, ToQTextDocument
+from novelwriter.formats.shared import TextDocumentTheme
+from novelwriter.formats.toqdoc import ToQTextDocument
 from novelwriter.gui.theme import STYLES_MIN_TOOLBUTTON
 from novelwriter.types import (
     QtAlignCenterTop, QtKeepAnchor, QtMouseLeft, QtMoveAnchor,
diff --git a/novelwriter/types.py b/novelwriter/types.py
index ab684dee..e9db0876 100644
--- a/novelwriter/types.py
+++ b/novelwriter/types.py
@@ -65,6 +65,10 @@ QtPaintAnitAlias = QPainter.RenderHint.Antialiasing
 QtMouseOver = QStyle.StateFlag.State_MouseOver
 QtSelected = QStyle.StateFlag.State_Selected
 
+# Qt Colour Types
+
+QtHexRgb = QColor.NameFormat.HexRgb
+
 # Qt Tree and Table Types
 
 QtDecoration = Qt.ItemDataRole.DecorationRole
diff --git a/tests/reference/fmtToDocX_SaveDocument_styles.xml b/tests/reference/fmtToDocX_SaveDocument_styles.xml
index a8c8a16f..0fb4e06b 100644
--- a/tests/reference/fmtToDocX_SaveDocument_styles.xml
+++ b/tests/reference/fmtToDocX_SaveDocument_styles.xml
@@ -50,7 +50,7 @@
     </w:pPr>
     <w:rPr>
       <w:b />
-      <w:color w:val="2a6099" />
+      <w:color w:val="4271ae" />
       <w:sz w:val="48" />
       <w:szCs w:val="48" />
     </w:rPr>
@@ -65,7 +65,7 @@
     </w:pPr>
     <w:rPr>
       <w:b />
-      <w:color w:val="2a6099" />
+      <w:color w:val="4271ae" />
       <w:sz w:val="42" />
       <w:szCs w:val="42" />
     </w:rPr>
@@ -80,7 +80,7 @@
     </w:pPr>
     <w:rPr>
       <w:b />
-      <w:color w:val="444444" />
+      <w:color w:val="4271ae" />
       <w:sz w:val="36" />
       <w:szCs w:val="36" />
     </w:rPr>
@@ -95,7 +95,7 @@
     </w:pPr>
     <w:rPr>
       <w:b />
-      <w:color w:val="444444" />
+      <w:color w:val="4271ae" />
       <w:sz w:val="30" />
       <w:szCs w:val="30" />
     </w:rPr>
diff --git a/tests/reference/fmtToOdt_SaveFlat_document.fodt b/tests/reference/fmtToOdt_SaveFlat_document.fodt
index 14c9e9a4..6280be49 100644
--- a/tests/reference/fmtToOdt_SaveFlat_document.fodt
+++ b/tests/reference/fmtToOdt_SaveFlat_document.fodt
@@ -1,13 +1,13 @@
 <?xml version='1.0' encoding='utf-8'?>
 <office:document xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:fo="urn:oasis:names:tc:opendocument:xmlns:xsl-fo-compatible:1.0" xmlns:loext="urn:org:documentfoundation:names:experimental:office:xmlns:loext:1.0" xmlns:meta="urn:oasis:names:tc:opendocument:xmlns:meta:1.0" xmlns:office="urn:oasis:names:tc:opendocument:xmlns:office:1.0" xmlns:style="urn:oasis:names:tc:opendocument:xmlns:style:1.0" xmlns:text="urn:oasis:names:tc:opendocument:xmlns:text:1.0" office:version="1.3" office:mimetype="application/vnd.oasis.opendocument.text">
   <office:meta>
-    <meta:creation-date>2024-10-17T22:22:08</meta:creation-date>
+    <meta:creation-date>2024-10-22T11:39:53</meta:creation-date>
     <meta:generator>novelWriter/2.6a1</meta:generator>
     <meta:initial-creator>Jane Smith</meta:initial-creator>
     <meta:editing-cycles>1234</meta:editing-cycles>
     <meta:editing-duration>P42DT12H34M56S</meta:editing-duration>
     <dc:title>Test Project</dc:title>
-    <dc:date>2024-10-17T22:22:08</dc:date>
+    <dc:date>2024-10-22T11:39:53</dc:date>
     <dc:creator>Jane Smith</dc:creator>
   </office:meta>
   <office:font-face-decls>
@@ -47,19 +47,19 @@
     </style:style>
     <style:style style:name="Heading_20_1" style:family="paragraph" style:display-name="Heading 1" style:parent-style-name="Heading" style:next-style-name="Text_20_body" style:default-outline-level="1" style:class="text">
       <style:paragraph-properties fo:margin-top="0.601cm" fo:margin-bottom="0.212cm" />
-      <style:text-properties style:font-name="Liberation Serif" fo:font-family="Liberation Serif" fo:font-size="24pt" fo:font-weight="bold" fo:color="#2a6099" loext:opacity="100%" />
+      <style:text-properties style:font-name="Liberation Serif" fo:font-family="Liberation Serif" fo:font-size="24pt" fo:font-weight="bold" fo:color="#4271ae" loext:opacity="100%" />
     </style:style>
     <style:style style:name="Heading_20_2" style:family="paragraph" style:display-name="Heading 2" style:parent-style-name="Heading" style:next-style-name="Text_20_body" style:default-outline-level="2" style:class="text">
       <style:paragraph-properties fo:margin-top="0.707cm" fo:margin-bottom="0.212cm" />
-      <style:text-properties style:font-name="Liberation Serif" fo:font-family="Liberation Serif" fo:font-size="21pt" fo:font-weight="bold" fo:color="#2a6099" loext:opacity="100%" />
+      <style:text-properties style:font-name="Liberation Serif" fo:font-family="Liberation Serif" fo:font-size="21pt" fo:font-weight="bold" fo:color="#4271ae" loext:opacity="100%" />
     </style:style>
     <style:style style:name="Heading_20_3" style:family="paragraph" style:display-name="Heading 3" style:parent-style-name="Heading" style:next-style-name="Text_20_body" style:default-outline-level="3" style:class="text">
       <style:paragraph-properties fo:margin-top="0.495cm" fo:margin-bottom="0.212cm" />
-      <style:text-properties style:font-name="Liberation Serif" fo:font-family="Liberation Serif" fo:font-size="18pt" fo:font-weight="bold" fo:color="#444444" loext:opacity="100%" />
+      <style:text-properties style:font-name="Liberation Serif" fo:font-family="Liberation Serif" fo:font-size="18pt" fo:font-weight="bold" fo:color="#4271ae" loext:opacity="100%" />
     </style:style>
     <style:style style:name="Heading_20_4" style:family="paragraph" style:display-name="Heading 4" style:parent-style-name="Heading" style:next-style-name="Text_20_body" style:default-outline-level="4" style:class="text">
       <style:paragraph-properties fo:margin-top="0.495cm" fo:margin-bottom="0.212cm" />
-      <style:text-properties style:font-name="Liberation Serif" fo:font-family="Liberation Serif" fo:font-size="15pt" fo:font-weight="bold" fo:color="#444444" loext:opacity="100%" />
+      <style:text-properties style:font-name="Liberation Serif" fo:font-family="Liberation Serif" fo:font-size="15pt" fo:font-weight="bold" fo:color="#4271ae" loext:opacity="100%" />
     </style:style>
     <style:style style:name="Header" style:family="paragraph" style:display-name="Header" style:parent-style-name="Header_20_and_20_Footer">
       <style:paragraph-properties fo:text-align="right" />
diff --git a/tests/reference/fmtToOdt_SaveFull_styles.xml b/tests/reference/fmtToOdt_SaveFull_styles.xml
index 708be359..e66e2d7e 100644
--- a/tests/reference/fmtToOdt_SaveFull_styles.xml
+++ b/tests/reference/fmtToOdt_SaveFull_styles.xml
@@ -37,19 +37,19 @@
     </style:style>
     <style:style style:name="Heading_20_1" style:family="paragraph" style:display-name="Heading 1" style:parent-style-name="Heading" style:next-style-name="Text_20_body" style:default-outline-level="1" style:class="text">
       <style:paragraph-properties fo:margin-top="0.601cm" fo:margin-bottom="0.212cm" />
-      <style:text-properties style:font-name="Liberation Serif" fo:font-family="Liberation Serif" fo:font-size="24pt" fo:font-weight="bold" fo:color="#2a6099" loext:opacity="100%" />
+      <style:text-properties style:font-name="Liberation Serif" fo:font-family="Liberation Serif" fo:font-size="24pt" fo:font-weight="bold" fo:color="#4271ae" loext:opacity="100%" />
     </style:style>
     <style:style style:name="Heading_20_2" style:family="paragraph" style:display-name="Heading 2" style:parent-style-name="Heading" style:next-style-name="Text_20_body" style:default-outline-level="2" style:class="text">
       <style:paragraph-properties fo:margin-top="0.707cm" fo:margin-bottom="0.212cm" />
-      <style:text-properties style:font-name="Liberation Serif" fo:font-family="Liberation Serif" fo:font-size="21pt" fo:font-weight="bold" fo:color="#2a6099" loext:opacity="100%" />
+      <style:text-properties style:font-name="Liberation Serif" fo:font-family="Liberation Serif" fo:font-size="21pt" fo:font-weight="bold" fo:color="#4271ae" loext:opacity="100%" />
     </style:style>
     <style:style style:name="Heading_20_3" style:family="paragraph" style:display-name="Heading 3" style:parent-style-name="Heading" style:next-style-name="Text_20_body" style:default-outline-level="3" style:class="text">
       <style:paragraph-properties fo:margin-top="0.495cm" fo:margin-bottom="0.212cm" />
-      <style:text-properties style:font-name="Liberation Serif" fo:font-family="Liberation Serif" fo:font-size="18pt" fo:font-weight="bold" fo:color="#444444" loext:opacity="100%" />
+      <style:text-properties style:font-name="Liberation Serif" fo:font-family="Liberation Serif" fo:font-size="18pt" fo:font-weight="bold" fo:color="#4271ae" loext:opacity="100%" />
     </style:style>
     <style:style style:name="Heading_20_4" style:family="paragraph" style:display-name="Heading 4" style:parent-style-name="Heading" style:next-style-name="Text_20_body" style:default-outline-level="4" style:class="text">
       <style:paragraph-properties fo:margin-top="0.495cm" fo:margin-bottom="0.212cm" />
-      <style:text-properties style:font-name="Liberation Serif" fo:font-family="Liberation Serif" fo:font-size="15pt" fo:font-weight="bold" fo:color="#444444" loext:opacity="100%" />
+      <style:text-properties style:font-name="Liberation Serif" fo:font-family="Liberation Serif" fo:font-size="15pt" fo:font-weight="bold" fo:color="#4271ae" loext:opacity="100%" />
     </style:style>
     <style:style style:name="Header" style:family="paragraph" style:display-name="Header" style:parent-style-name="Header_20_and_20_Footer">
       <style:paragraph-properties fo:text-align="right" />
diff --git a/tests/reference/mBuildDocBuild_HTML5_Lorem_Ipsum.htm b/tests/reference/mBuildDocBuild_HTML5_Lorem_Ipsum.htm
index 794071e8..9f9802ae 100644
--- a/tests/reference/mBuildDocBuild_HTML5_Lorem_Ipsum.htm
+++ b/tests/reference/mBuildDocBuild_HTML5_Lorem_Ipsum.htm
@@ -5,12 +5,12 @@
 <title>Lorem Ipsum</title>
 </head>
 <style>
-body {font-family: 'Arial'; font-size: 12pt; font-weight: 400; font-style: normal;}
+body {color: #000000; font-family: 'Arial'; font-size: 12pt; font-weight: 400; font-style: normal;}
 p {text-align: left; line-height: 150%; margin-top: 0.00em; margin-bottom: 0.76em;}
-h1 {color: rgb(66, 113, 174); page-break-after: avoid; margin-top: 1.85em; margin-bottom: 0.65em;}
-h2 {color: rgb(66, 113, 174); page-break-after: avoid; margin-top: 2.18em; margin-bottom: 0.65em;}
-h3 {color: rgb(50, 50, 50); page-break-after: avoid; margin-top: 1.53em; margin-bottom: 0.65em;}
-h4 {color: rgb(50, 50, 50); page-break-after: avoid; margin-top: 1.53em; margin-bottom: 0.65em;}
+h1 {color: #4271ae; page-break-after: avoid; margin-top: 1.85em; margin-bottom: 0.65em;}
+h2 {color: #4271ae; page-break-after: avoid; margin-top: 2.18em; margin-bottom: 0.65em;}
+h3 {color: #4271ae; page-break-after: avoid; margin-top: 1.53em; margin-bottom: 0.65em;}
+h4 {color: #4271ae; page-break-after: avoid; margin-top: 1.53em; margin-bottom: 0.65em;}
 .title {font-size: 2.5em; margin-top: 1.85em; margin-bottom: 0.65em;}
 .sep, .skip {text-align: center; margin-top: 1.30em; margin-bottom: 1.30em;}
 a {color: rgb(66, 113, 174);}
diff --git a/tests/reference/mBuildDocBuild_HTML5_Lorem_Ipsum.json b/tests/reference/mBuildDocBuild_HTML5_Lorem_Ipsum.json
index 5bac49d9..74b96ce2 100644
--- a/tests/reference/mBuildDocBuild_HTML5_Lorem_Ipsum.json
+++ b/tests/reference/mBuildDocBuild_HTML5_Lorem_Ipsum.json
@@ -2,17 +2,17 @@
   "meta": {
     "projectName": "Lorem Ipsum",
     "novelAuthor": "lipsum.com",
-    "buildTime": 1729529369,
-    "buildTimeStr": "2024-10-21 18:49:29"
+    "buildTime": 1729590078,
+    "buildTimeStr": "2024-10-22 11:41:18"
   },
   "text": {
     "css": [
-      "body {font-family: 'Arial'; font-size: 12pt; font-weight: 400; font-style: normal;}",
+      "body {color: #000000; font-family: 'Arial'; font-size: 12pt; font-weight: 400; font-style: normal;}",
       "p {text-align: left; line-height: 150%; margin-top: 0.00em; margin-bottom: 0.76em;}",
-      "h1 {color: rgb(66, 113, 174); page-break-after: avoid; margin-top: 1.85em; margin-bottom: 0.65em;}",
-      "h2 {color: rgb(66, 113, 174); page-break-after: avoid; margin-top: 2.18em; margin-bottom: 0.65em;}",
-      "h3 {color: rgb(50, 50, 50); page-break-after: avoid; margin-top: 1.53em; margin-bottom: 0.65em;}",
-      "h4 {color: rgb(50, 50, 50); page-break-after: avoid; margin-top: 1.53em; margin-bottom: 0.65em;}",
+      "h1 {color: #4271ae; page-break-after: avoid; margin-top: 1.85em; margin-bottom: 0.65em;}",
+      "h2 {color: #4271ae; page-break-after: avoid; margin-top: 2.18em; margin-bottom: 0.65em;}",
+      "h3 {color: #4271ae; page-break-after: avoid; margin-top: 1.53em; margin-bottom: 0.65em;}",
+      "h4 {color: #4271ae; page-break-after: avoid; margin-top: 1.53em; margin-bottom: 0.65em;}",
       ".title {font-size: 2.5em; margin-top: 1.85em; margin-bottom: 0.65em;}",
       ".sep, .skip {text-align: center; margin-top: 1.30em; margin-bottom: 1.30em;}",
       "a {color: rgb(66, 113, 174);}",
diff --git a/tests/reference/mBuildDocBuild_OpenDocument_Lorem_Ipsum.fodt b/tests/reference/mBuildDocBuild_OpenDocument_Lorem_Ipsum.fodt
index 7868a9ec..43e7a3ca 100644
--- a/tests/reference/mBuildDocBuild_OpenDocument_Lorem_Ipsum.fodt
+++ b/tests/reference/mBuildDocBuild_OpenDocument_Lorem_Ipsum.fodt
@@ -1,13 +1,13 @@
 <?xml version='1.0' encoding='utf-8'?>
 <office:document xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:fo="urn:oasis:names:tc:opendocument:xmlns:xsl-fo-compatible:1.0" xmlns:loext="urn:org:documentfoundation:names:experimental:office:xmlns:loext:1.0" xmlns:meta="urn:oasis:names:tc:opendocument:xmlns:meta:1.0" xmlns:office="urn:oasis:names:tc:opendocument:xmlns:office:1.0" xmlns:style="urn:oasis:names:tc:opendocument:xmlns:style:1.0" xmlns:text="urn:oasis:names:tc:opendocument:xmlns:text:1.0" office:version="1.3" office:mimetype="application/vnd.oasis.opendocument.text">
   <office:meta>
-    <meta:creation-date>2024-10-21T18:49:29</meta:creation-date>
+    <meta:creation-date>2024-10-22T11:39:52</meta:creation-date>
     <meta:generator>novelWriter/2.6a1</meta:generator>
     <meta:initial-creator>lipsum.com</meta:initial-creator>
     <meta:editing-cycles>45</meta:editing-cycles>
     <meta:editing-duration>P0DT0H36M8S</meta:editing-duration>
     <dc:title>Lorem Ipsum</dc:title>
-    <dc:date>2024-10-21T18:49:29</dc:date>
+    <dc:date>2024-10-22T11:39:52</dc:date>
     <dc:creator>lipsum.com</dc:creator>
   </office:meta>
   <office:font-face-decls>
@@ -47,19 +47,19 @@
     </style:style>
     <style:style style:name="Heading_20_1" style:family="paragraph" style:display-name="Heading 1" style:parent-style-name="Heading" style:next-style-name="Text_20_body" style:default-outline-level="1" style:class="text">
       <style:paragraph-properties fo:margin-top="0.784cm" fo:margin-bottom="0.276cm" />
-      <style:text-properties style:font-name="Arial" fo:font-family="Arial" fo:font-size="24pt" fo:font-weight="bold" fo:color="#2a6099" loext:opacity="100%" />
+      <style:text-properties style:font-name="Arial" fo:font-family="Arial" fo:font-size="24pt" fo:font-weight="bold" fo:color="#4271ae" loext:opacity="100%" />
     </style:style>
     <style:style style:name="Heading_20_2" style:family="paragraph" style:display-name="Heading 2" style:parent-style-name="Heading" style:next-style-name="Text_20_body" style:default-outline-level="2" style:class="text">
       <style:paragraph-properties fo:margin-top="0.922cm" fo:margin-bottom="0.276cm" />
-      <style:text-properties style:font-name="Arial" fo:font-family="Arial" fo:font-size="21pt" fo:font-weight="bold" fo:color="#2a6099" loext:opacity="100%" />
+      <style:text-properties style:font-name="Arial" fo:font-family="Arial" fo:font-size="21pt" fo:font-weight="bold" fo:color="#4271ae" loext:opacity="100%" />
     </style:style>
     <style:style style:name="Heading_20_3" style:family="paragraph" style:display-name="Heading 3" style:parent-style-name="Heading" style:next-style-name="Text_20_body" style:default-outline-level="3" style:class="text">
       <style:paragraph-properties fo:margin-top="0.646cm" fo:margin-bottom="0.276cm" />
-      <style:text-properties style:font-name="Arial" fo:font-family="Arial" fo:font-size="18pt" fo:font-weight="bold" fo:color="#444444" loext:opacity="100%" />
+      <style:text-properties style:font-name="Arial" fo:font-family="Arial" fo:font-size="18pt" fo:font-weight="bold" fo:color="#4271ae" loext:opacity="100%" />
     </style:style>
     <style:style style:name="Heading_20_4" style:family="paragraph" style:display-name="Heading 4" style:parent-style-name="Heading" style:next-style-name="Text_20_body" style:default-outline-level="4" style:class="text">
       <style:paragraph-properties fo:margin-top="0.646cm" fo:margin-bottom="0.276cm" />
-      <style:text-properties style:font-name="Arial" fo:font-family="Arial" fo:font-size="15pt" fo:font-weight="bold" fo:color="#444444" loext:opacity="100%" />
+      <style:text-properties style:font-name="Arial" fo:font-family="Arial" fo:font-size="15pt" fo:font-weight="bold" fo:color="#4271ae" loext:opacity="100%" />
     </style:style>
     <style:style style:name="Header" style:family="paragraph" style:display-name="Header" style:parent-style-name="Header_20_and_20_Footer">
       <style:paragraph-properties fo:text-align="right" />
diff --git a/tests/test_formats/test_fmt_toodt.py b/tests/test_formats/test_fmt_toodt.py
index 7f75b935..971cddda 100644
--- a/tests/test_formats/test_fmt_toodt.py
+++ b/tests/test_formats/test_fmt_toodt.py
@@ -27,6 +27,8 @@ from shutil import copyfile
 
 import pytest
 
+from PyQt5.QtGui import QColor
+
 from novelwriter.common import xmlIndent
 from novelwriter.constants import nwHeadFmt
 from novelwriter.core.project import NWProject
@@ -1106,11 +1108,15 @@ def testFmtToOdt_ODTParagraphStyle():
     assert parStyle._tAttr["color"]   == ["fo", None]
     assert parStyle._tAttr["opacity"] == ["loext", None]
 
-    parStyle.setColour("#000000")
-    parStyle.setOpacity("1.00")
+    parStyle.setColour(QColor(0, 0, 0, 128))
 
     assert parStyle._tAttr["color"]   == ["fo", "#000000"]
-    assert parStyle._tAttr["opacity"] == ["loext", "1.00"]
+    assert parStyle._tAttr["opacity"] == ["loext", "50%"]
+
+    parStyle.setColour(None)
+
+    assert parStyle._tAttr["color"]   == ["fo", None]
+    assert parStyle._tAttr["opacity"] == ["loext", None]
 
     # Pack XML
     # ========
@@ -1124,7 +1130,7 @@ def testFmtToOdt_ODTParagraphStyle():
         'fo:margin-left="0.000cm" fo:margin-right="0.000cm" fo:text-indent="0.000cm" '
         'fo:line-height="1.15" />'
         '<style:text-properties style:font-name="Verdana" fo:font-family="Verdana" '
-        'fo:font-size="12pt" fo:color="#000000" loext:opacity="1.00" />'
+        'fo:font-size="12pt" />'
         '</style:style>'
         '</test>'
     )
@@ -1151,8 +1157,8 @@ def testFmtToOdt_ODTParagraphStyle():
 
     aStyle = ODTParagraphStyle("test")
     oStyle = ODTParagraphStyle("test")
-    aStyle.setColour("#000000")
-    oStyle.setColour("#111111")
+    aStyle.setColour(QColor(0, 0, 0))
+    oStyle.setColour(QColor(42, 42, 42))
     assert aStyle.checkNew(oStyle) is True
     assert aStyle.getID() != oStyle.getID()
 
diff --git a/tests/test_formats/test_fmt_toqdoc.py b/tests/test_formats/test_fmt_toqdoc.py
index 67417da8..48c3b6cb 100644
--- a/tests/test_formats/test_fmt_toqdoc.py
+++ b/tests/test_formats/test_fmt_toqdoc.py
@@ -27,8 +27,8 @@ from PyQt5.QtGui import QTextBlock, QTextCharFormat, QTextCursor
 from novelwriter import CONFIG
 from novelwriter.constants import nwUnicode
 from novelwriter.core.project import NWProject
-from novelwriter.formats.shared import BlockFmt, BlockTyp
-from novelwriter.formats.toqdoc import TextDocumentTheme, ToQTextDocument
+from novelwriter.formats.shared import BlockFmt, BlockTyp, TextDocumentTheme
+from novelwriter.formats.toqdoc import ToQTextDocument
 from novelwriter.types import (
     QtAlignAbsolute, QtAlignCenter, QtAlignJustify, QtAlignLeft, QtAlignRight,
     QtPageBreakAfter, QtTransparent, QtVAlignNormal, QtVAlignSub, QtVAlignSuper