diff --git a/common/pkgs/bin.nix b/common/pkgs/bin.nix
index 1f69928..4286d47 100644
--- a/common/pkgs/bin.nix
+++ b/common/pkgs/bin.nix
@@ -11,6 +11,22 @@ pkgs.rustPlatform.buildRustPackage rec {
     sha256 = "sha256-c5iuk1T3x17iEbLAno716pkQkRtVsB0UJzgIrR64Uec=";
   };
 
+  # Use custom syntax highlighting theme
+  preBuild = ''
+    cp ${
+      ../../external/paramount-dark.tmTheme
+    } resources/themes/paramount-dark.tmTheme
+
+    substituteInPlace src/models/pretty.rs \
+      --replace "ayu_dark.tmTheme" "paramount-dark.tmTheme" \
+
+    substituteInPlace static/css/index.css static/css/pretty.css templates/* \
+      --replace "#0f1419" "#000000" \
+      --replace "#f29718" "#a790d5" \
+      --replace "#F29718" "#a790d5" \
+      --replace "#be7611" "#8673aa"
+  '';
+
   cargoLock = { lockFile = "${src}/Cargo.lock"; };
 
   nativeBuildInputs = [ pkgs.git ];
diff --git a/external/paramount-dark.tmTheme b/external/paramount-dark.tmTheme
new file mode 100644
index 0000000..977c852
--- /dev/null
+++ b/external/paramount-dark.tmTheme
@@ -0,0 +1,247 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<!-- Color Theme paramount-dark, created by  Oskar Wickström .
+Created with ThemeCreator, https://github.com/mswift42/themecreator -->
+<plist version="1.0">
+<dict>
+	<key>author</key>
+	<string> Oskar Wickström</string>
+	<key>name</key>
+	<string>paramount-dark</string>
+	<key>settings</key>
+	<array>
+		<dict>
+			<key>settings</key>
+			<dict>
+				<key>background</key>
+				<string>#000000</string>
+				<key>caret</key>
+				<string>#292929</string>
+				<key>foreground</key>
+				<string>#C6C6C6</string>
+				<key>invisibles</key>
+				<string>#292929</string>
+				<key>lineHighlight</key>
+				<string>#141414</string>
+				<key>selection</key>
+				<string>#292929</string>
+			</dict>
+		</dict>
+		<dict>
+			<key>name</key>
+			<string>Comment</string>
+			<key>scope</key>
+			<string>comment</string>
+			<key>settings</key>
+			<dict>
+				<key>foreground</key>
+				<string>#4E4E4E</string>
+			</dict>
+		</dict>
+		<dict>
+			<key>name</key>
+			<string>Foreground</string>
+			<key>scope</key>
+			<string>keyword.operator.class, constant.other, source.php.embedded.line</string>
+			<key>settings</key>
+			<dict>
+				<key>fontStyle</key>
+				<string></string>
+				<key>foreground</key>
+				<string>#a6a6a6</string>
+			</dict>
+		</dict>
+		<dict>
+			<key>name</key>
+			<string>Variable, String Link, Regular Expression, Tag Name, GitGutter deleted</string>
+			<key>scope</key>
+			<string>variable, support.other.variable, string.other.link, string.regexp, entity.name.tag, entity.other.attribute-name, meta.tag, declaration.tag, markup.deleted.git_gutter</string>
+			<key>settings</key>
+			<dict>
+				<key>foreground</key>
+				<string>#C6C6C6</string>
+			</dict>
+		</dict>
+		<dict>
+			<key>name</key>
+			<string>Number, Constant, Function Argument, Tag Attribute, Embedded</string>
+			<key>scope</key>
+			<string>constant.numeric, constant.language, support.constant, constant.character, variable.parameter, punctuation.section.embedded, keyword.other.unit</string>
+			<key>settings</key>
+			<dict>
+				<key>fontStyle</key>
+				<string></string>
+				<key>foreground</key>
+				<string>#a790d5</string>
+			</dict>
+		</dict>
+		<dict>
+			<key>name</key>
+			<string>Class, Support</string>
+			<key>scope</key>
+			<string>entity.name.class, entity.name.type.class, support.type, support.class</string>
+			<key>settings</key>
+			<dict>
+				<key>fontStyle</key>
+				<string></string>
+				<key>foreground</key>
+				<string>#C6C6C6</string>
+			</dict>
+		</dict>
+		<dict>
+			<key>name</key>
+			<string>String, Symbols, Inherited Class, Markup Heading, GitGutter inserted</string>
+			<key>scope</key>
+			<string>string, constant.other.symbol, entity.other.inherited-class, entity.name.filename, markup.heading, markup.inserted.git_gutter</string>
+			<key>settings</key>
+			<dict>
+				<key>fontStyle</key>
+				<string></string>
+				<key>foreground</key>
+				<string>#a790d5</string>
+			</dict>
+		</dict>
+		<dict>
+			<key>name</key>
+			<string>Operator, Misc</string>
+			<key>scope</key>
+			<string>keyword.operator, constant.other.color</string>
+			<key>settings</key>
+			<dict>
+				<key>foreground</key>
+				<string>#767676</string>
+			</dict>
+		</dict>
+		<dict>
+			<key>name</key>
+			<string>Function, Special Method, Block Level, GitGutter changed</string>
+			<key>scope</key>
+			<string>entity.name.function, meta.function-call, support.function, keyword.other.special-method, meta.block-level, markup.changed.git_gutter</string>
+			<key>settings</key>
+			<dict>
+				<key>fontStyle</key>
+				<string></string>
+				<key>foreground</key>
+				<string>#C6C6C6</string>
+			</dict>
+		</dict>
+		<dict>
+			<key>name</key>
+			<string>Keyword, Storage</string>
+			<key>scope</key>
+			<string>keyword, storage, storage.type</string>
+			<key>settings</key>
+			<dict>
+				<key>fontStyle</key>
+				<string>bold</string>
+				<key>foreground</key>
+				<string>#767676</string>
+			</dict>
+		</dict>
+		<dict>
+			<key>name</key>
+			<string>Invalid</string>
+			<key>scope</key>
+			<string>invalid</string>
+			<key>settings</key>
+			<dict>
+				<key>background</key>
+				<string>#E32791</string>
+				<key>fontStyle</key>
+				<string></string>
+				<key>foreground</key>
+				<string>#C6C6C6</string>
+			</dict>
+		</dict>
+		<dict>
+			<key>name</key>
+			<string>Separator</string>
+			<key>scope</key>
+			<string>meta.separator</string>
+			<key>settings</key>
+			<dict>
+				<key>foreground</key>
+				<string>#C6C6C6</string>
+			</dict>
+		</dict>
+		<dict>
+			<key>name</key>
+			<string>Deprecated</string>
+			<key>scope</key>
+			<string>invalid.deprecated</string>
+			<key>settings</key>
+			<dict>
+				<key>background</key>
+				<string>#a790d5</string>
+				<key>fontStyle</key>
+				<string></string>
+				<key>foreground</key>
+				<string>#000000</string>
+			</dict>
+		</dict>
+		<dict>
+			<key>name</key>
+			<string>Diff foreground</string>
+			<key>scope</key>
+			<string>markup.inserted.diff, markup.deleted.diff, meta.diff.header.to-file, meta.diff.header.from-file</string>
+			<key>settings</key>
+			<dict>
+				<key>foreground</key>
+				<string>#fafafa</string>
+			</dict>
+		</dict>
+		<dict>
+			<key>name</key>
+			<string>Diff insertion</string>
+			<key>scope</key>
+			<string>markup.inserted.diff, meta.diff.header.to-file</string>
+			<key>settings</key>
+			<dict>
+				<key>background</key>
+				<string>#123d0f</string>
+			</dict>
+		</dict>
+		<dict>
+			<key>name</key>
+			<string>Diff deletion</string>
+			<key>scope</key>
+			<string>markup.deleted.diff, meta.diff.header.from-file</string>
+			<key>settings</key>
+			<dict>
+				<key>background</key>
+				<string></string>
+			</dict>
+		</dict>
+		<dict>
+			<key>name</key>
+			<string>Diff header</string>
+			<key>scope</key>
+			<string>meta.diff.header.from-file, meta.diff.header.to-file</string>
+			<key>settings</key>
+			<dict>
+				<key>foreground</key>
+				<string></string>
+				<key>background</key>
+				<string></string>
+			</dict>
+		</dict>
+		<dict>
+			<key>name</key>
+			<string>Diff range</string>
+			<key>scope</key>
+			<string>meta.diff.range</string>
+			<key>settings</key>
+			<dict>
+				<key>fontStyle</key>
+				<string>italic</string>
+				<key>foreground</key>
+				<string>#767676</string>
+			</dict>
+		</dict>
+	</array>
+	<key>uuid</key>
+	<string></string>
+  <key>colorSpaceName</key>
+  <string>sRGB</string>
+</dict>
+</plist>