diff --git a/assets/css/main.css b/assets/css/main.css
index 3eb7010..2f60a2c 100644
--- a/assets/css/main.css
+++ b/assets/css/main.css
@@ -309,6 +309,7 @@ a:hover,
     /* Activate hardware acceleration for smoother animations */
     transform: translate3d(0, 0, 0);
     backface-visibility: hidden;
+    z-index: -1;
 }
 
 /* Docs */