diff --git a/web_src/css/modules/dimmer.css b/web_src/css/modules/dimmer.css
index 84b8ef60be..a552d103e5 100644
--- a/web_src/css/modules/dimmer.css
+++ b/web_src/css/modules/dimmer.css
@@ -13,7 +13,7 @@
   overflow-y: auto;
   justify-content: center;
   padding: 8px 0;
-  animation: fadein;
+  animation-name: fadein;
   animation-duration: .2s;
   user-select: none;
 }