diff --git a/memory-game.css b/memory-game.css
index 157ab81..33be0e2 100644
--- a/memory-game.css
+++ b/memory-game.css
@@ -30,9 +30,6 @@ html .h5p-memory-game > ul {
   -webkit-perspective: 400px;
   -moz-perspective: 400px;
   perspective: 400px;
-  -webkit-transform-style: preserve-3d;
-  -moz-transform-style: preserve-3d;
-  transform-style: preserve-3d;
   -webkit-transition: opacity 0.4s;
   -moz-transition: opacity 0.4s;
   transition: opacity 0.4s;