diff --git a/src/platform/web/ui/common.js b/src/platform/web/ui/common.js
index 15a522c7..5551ed09 100644
--- a/src/platform/web/ui/common.js
+++ b/src/platform/web/ui/common.js
@@ -20,15 +20,16 @@ export function spinner(t, extraClasses = undefined) {
     if (container === undefined) {
         container = document.querySelector(".hydrogen");
     }
+    const classes = Object.assign({"spinner": true}, extraClasses);
     if (container?.classList.contains("legacy")) {
-        return t.div({className: "spinner"}, [
+        return t.div({className: classes}, [
             t.div(),
             t.div(),
             t.div(),
             t.div(),
         ]);
     } else {
-        return t.svg({className: Object.assign({"spinner": true}, extraClasses), viewBox:"0 0 100 100"}, 
+        return t.svg({className: classes, viewBox:"0 0 100 100"}, 
             t.circle({cx:"50%", cy:"50%", r:"45%", pathLength:"100"})
         );
     }