diff --git a/panels/dev-template/ha-panel-dev-template.html b/panels/dev-template/ha-panel-dev-template.html
index 583b39e615..daadcbba32 100644
--- a/panels/dev-template/ha-panel-dev-template.html
+++ b/panels/dev-template/ha-panel-dev-template.html
@@ -50,12 +50,12 @@
 
       paper-textarea {
         --paper-input-container-input: {
-          @apply(--paper-font-code1);
+          @apply --paper-font-code1;
         }
       }
 
       .rendered {
-        @apply(--paper-font-code1)
+        @apply --paper-font-code1;
         clear: both;
         white-space: pre-wrap;
       }