diff --git a/res/themes/dark/css/_dark.scss b/res/themes/dark/css/_dark.scss
index 57cbc7efa9..1f814f08b8 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;
+}