diff --git a/examples/popup.css b/examples/popup.css
index 2f134d5dc2..467da94b8e 100644
--- a/examples/popup.css
+++ b/examples/popup.css
@@ -1,8 +1,7 @@
 .ol-popup {
   position: absolute;
   background-color: white;
-  -webkit-filter: drop-shadow(0 1px 4px rgba(0,0,0,0.2));
-  filter: drop-shadow(0 1px 4px rgba(0,0,0,0.2));
+  box-shadow: 0 1px 4px rgba(0,0,0,0.2);
   padding: 15px;
   border-radius: 10px;
   border: 1px solid #cccccc;