diff --git a/res/css/views/rooms/_EventTile.scss b/res/css/views/rooms/_EventTile.scss
index 27a83e58f8..55f73c0315 100644
--- a/res/css/views/rooms/_EventTile.scss
+++ b/res/css/views/rooms/_EventTile.scss
@@ -477,8 +477,7 @@ $hover-select-border: 4px;
 
     pre, code {
         font-family: $monospace-font-family !important;
-        // deliberate constants as we're behind an invert filter
-        color: #333;
+        background-color: $header-panel-bg-color;
     }
 
     pre {
@@ -488,11 +487,6 @@ $hover-select-border: 4px;
         overflow-x: overlay;
         overflow-y: visible;
     }
-
-    code {
-        // deliberate constants as we're behind an invert filter
-        background-color: #f8f8f8;
-    }
 }
 
 .mx_EventTile_lineNumbers {
diff --git a/res/themes/dark/css/_dark.scss b/res/themes/dark/css/_dark.scss
index 81fd3c892a..57cbc7efa9 100644
--- a/res/themes/dark/css/_dark.scss
+++ b/res/themes/dark/css/_dark.scss
@@ -119,8 +119,6 @@ $voipcall-plinth-color: #394049;
 
 $theme-button-bg-color: #e3e8f0;
 $dialpad-button-bg-color: #6F7882;
-;
-
 
 $roomlist-button-bg-color: rgba(141, 151, 165, 0.2); // Buttons include the filter box, explore button, and sublist buttons
 $roomlist-filter-active-bg-color: $bg-color;
@@ -274,24 +272,7 @@ $composer-shadow-color: rgba(0, 0, 0, 0.28);
 }
 
 // markdown overrides:
-.mx_EventTile_content .markdown-body pre:hover {
-    border-color: #808080 !important; // inverted due to rules below
-    scrollbar-color: rgba(0, 0, 0, 0.2) transparent; // copied from light theme due to inversion below
-    // the code above works only in Firefox, this is for other browsers
-    // see https://developer.mozilla.org/en-US/docs/Web/CSS/scrollbar-color
-    &::-webkit-scrollbar-thumb {
-        background-color: rgba(0, 0, 0, 0.2); // copied from light theme due to inversion below
-    }
-}
 .mx_EventTile_content .markdown-body {
-    pre, code {
-        filter: invert(1);
-    }
-
-    pre code {
-        filter: none;
-    }
-
     table {
         tr {
             background-color: #000000;
@@ -301,18 +282,9 @@ $composer-shadow-color: rgba(0, 0, 0, 0.28);
             background-color: #080808;
         }
     }
-
-    blockquote {
-        color: #919191;
-    }
 }
 
-// diff highlight colors
-// intentionally swapped to avoid inversion
-.hljs-addition {
-    background: #fdd;
-}
-
-.hljs-deletion {
-    background: #dfd;
+// highlight.js overrides
+.hljs-tag {
+    color: inherit; // Without this they'd be weirdly blue which doesn't match the theme
 }
diff --git a/res/themes/dark/css/dark.scss b/res/themes/dark/css/dark.scss
index f9695018e4..600cfd528a 100644
--- a/res/themes/dark/css/dark.scss
+++ b/res/themes/dark/css/dark.scss
@@ -9,3 +9,4 @@
 @import "_dark.scss";
 @import "../../light/css/_mods.scss";
 @import "../../../../res/css/_components.scss";
+@import url("highlight.js/styles/atom-one-dark.css");
diff --git a/res/themes/legacy-dark/css/_legacy-dark.scss b/res/themes/legacy-dark/css/_legacy-dark.scss
index df01efbe1e..555ef4f66c 100644
--- a/res/themes/legacy-dark/css/_legacy-dark.scss
+++ b/res/themes/legacy-dark/css/_legacy-dark.scss
@@ -118,7 +118,7 @@ $voipcall-plinth-color: #394049;
 
 $theme-button-bg-color: #e3e8f0;
 $dialpad-button-bg-color: #6F7882;
-;
+
 
 $roomlist-button-bg-color: #1A1D23; // Buttons include the filter box, explore button, and sublist buttons
 $roomlist-filter-active-bg-color: $roomlist-button-bg-color;
@@ -249,7 +249,7 @@ $composer-shadow-color: tranparent;
 @define-mixin mx_DialogButton_secondary {
     // flip colours for the secondary ones
     font-weight: 600;
-    border: 1px solid $accent-color ! important;
+    border: 1px solid $accent-color !important;
     color: $accent-color;
     background-color: $button-secondary-bg-color;
 }
@@ -267,18 +267,7 @@ $composer-shadow-color: tranparent;
 }
 
 // markdown overrides:
-.mx_EventTile_content .markdown-body pre:hover {
-    border-color: #808080 !important; // inverted due to rules below
-}
 .mx_EventTile_content .markdown-body {
-    pre, code {
-        filter: invert(1);
-    }
-
-    pre code {
-        filter: none;
-    }
-
     table {
         tr {
             background-color: #000000;
@@ -290,12 +279,7 @@ $composer-shadow-color: tranparent;
     }
 }
 
-// diff highlight colors
-// intentionally swapped to avoid inversion
-.hljs-addition {
-    background: #fdd;
-}
-
-.hljs-deletion {
-    background: #dfd;
+// highlight.js overrides:
+.hljs-tag {
+    color: inherit; // Without this they'd be weirdly blue which doesn't match the theme
 }
diff --git a/res/themes/legacy-dark/css/legacy-dark.scss b/res/themes/legacy-dark/css/legacy-dark.scss
index 2a4d432d26..840794f7c0 100644
--- a/res/themes/legacy-dark/css/legacy-dark.scss
+++ b/res/themes/legacy-dark/css/legacy-dark.scss
@@ -4,3 +4,4 @@
 @import "../../legacy-light/css/_legacy-light.scss";
 @import "_legacy-dark.scss";
 @import "../../../../res/css/_components.scss";
+@import url("highlight.js/styles/atom-one-dark.css");
diff --git a/res/themes/legacy-light/css/legacy-light.scss b/res/themes/legacy-light/css/legacy-light.scss
index e39a1765f3..347d240fc6 100644
--- a/res/themes/legacy-light/css/legacy-light.scss
+++ b/res/themes/legacy-light/css/legacy-light.scss
@@ -3,3 +3,4 @@
 @import "_fonts.scss";
 @import "_legacy-light.scss";
 @import "../../../../res/css/_components.scss";
+@import url("highlight.js/styles/atom-one-light.css");
diff --git a/res/themes/light/css/light.scss b/res/themes/light/css/light.scss
index f31ce5c139..4e912bc756 100644
--- a/res/themes/light/css/light.scss
+++ b/res/themes/light/css/light.scss
@@ -4,3 +4,4 @@
 @import "_light.scss";
 @import "_mods.scss";
 @import "../../../../res/css/_components.scss";
+@import url("highlight.js/styles/atom-one-light.css");