diff --git a/src/css/prose.css b/src/css/prose.css
index 72776915..77615c4a 100644
--- a/src/css/prose.css
+++ b/src/css/prose.css
@@ -188,3 +188,9 @@
 .xlog-comment .prose p {
   @apply my-1;
 }
+
+@media (prefers-color-scheme:dark) {
+  .prose pre {
+    border: 1px solid;
+  }
+}