diff --git a/quartz/components/styles/explorer.scss b/quartz/components/styles/explorer.scss
index d0a6496..c17e1b8 100644
--- a/quartz/components/styles/explorer.scss
+++ b/quartz/components/styles/explorer.scss
@@ -14,6 +14,7 @@
 
     // Sticky top bar (stays in place when scrolling down on mobile).
     .sidebar.left:has(.explorer) {
+      z-index: 100; // needs to be higher than the content images's ( based on stacking context )
       box-sizing: border-box;
       position: sticky;
       background-color: var(--light);