diff --git a/src/layout/components/setting/index.vue b/src/layout/components/setting/index.vue
index 4d21b28c0..77988b25a 100644
--- a/src/layout/components/setting/index.vue
+++ b/src/layout/components/setting/index.vue
@@ -111,7 +111,7 @@ function storageConfigureChange<T>(key: string, val: T): void {
 function toggleClass(flag: boolean, clsName: string, target?: HTMLElement) {
   const targetEl = target || document.body;
   let { className } = targetEl;
-  className = className.replace(clsName, "");
+  className = className.replace(clsName, "").trim();
   targetEl.className = flag ? `${className} ${clsName} ` : className;
 }