diff --git a/frontend/src/App.module.css b/frontend/src/App.module.css
index 2fff30c..491b2ad 100644
--- a/frontend/src/App.module.css
+++ b/frontend/src/App.module.css
@@ -16,6 +16,7 @@
   animation-duration: 10s;
   animation-timing-function: linear;
   pointer-events: none;
+  z-index: -1;
 }
 
 .cell {