diff --git a/src/panels/lovelace/views/hui-view-background.ts b/src/panels/lovelace/views/hui-view-background.ts
index 2914af1c1ab2..bf322b4170ba 100644
--- a/src/panels/lovelace/views/hui-view-background.ts
+++ b/src/panels/lovelace/views/hui-view-background.ts
@@ -102,7 +102,7 @@ export class HUIViewBackground extends LitElement {
         position: fixed;
         background-attachment: scroll !important;
       }
-      :host(:not(fixed-background)) {
+      :host(:not([fixed-background])) {
         z-index: -1;
         position: absolute;
       }