diff --git a/res/css/views/rooms/_EventTile.scss b/res/css/views/rooms/_EventTile.scss
index 55f73c0315a..ebd50028434 100644
--- a/res/css/views/rooms/_EventTile.scss
+++ b/res/css/views/rooms/_EventTile.scss
@@ -480,6 +480,11 @@ $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 57cbc7efa96..1f814f08b84 100644
--- a/res/themes/dark/css/_dark.scss
+++ b/res/themes/dark/css/_dark.scss
@@ -288,3 +288,11 @@ $composer-shadow-color: rgba(0, 0, 0, 0.28);
 .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;
+}