diff --git a/quartz/styles/base.scss b/quartz/styles/base.scss
index af9c6f7..607749a 100644
--- a/quartz/styles/base.scss
+++ b/quartz/styles/base.scss
@@ -332,6 +332,7 @@ pre {
   border-radius: 5px;
   overflow-x: auto;
   border: 1px solid var(--lightgray);
+  position: relative;
 
   &:has(> code.mermaid) {
     border: none;