diff --git a/res/css/views/rooms/_EventTile.scss b/res/css/views/rooms/_EventTile.scss
index 1e3f51e5806..ab4fb28791f 100644
--- a/res/css/views/rooms/_EventTile.scss
+++ b/res/css/views/rooms/_EventTile.scss
@@ -471,6 +471,11 @@ $hover-select-border: 4px;
         background-color: $header-panel-bg-color;
     }
 
+    pre code > * {
+        display: inline-block;
+        width: 100%;
+    }
+
     pre {
         // have to use overlay rather than auto otherwise Linux and Windows
         // Chrome gets very confused about vertical spacing:
diff --git a/res/themes/dark/css/_dark.scss b/res/themes/dark/css/_dark.scss
index 2a4ebff0343..6a17f3ac165 100644
--- a/res/themes/dark/css/_dark.scss
+++ b/res/themes/dark/css/_dark.scss
@@ -295,3 +295,11 @@ $eventbubble-reply-color: #C1C6CD;
 .hljs-tag {
     color: inherit; // Without this they'd be weirdly blue which doesn't match the theme
 }
+
+.hljs-addition {
+    background: #1a4b59;
+}
+
+.hljs-deletion {
+    background: #53232a;
+}