diff --git a/src/client/theme-api/usePrefersColor.ts b/src/client/theme-api/usePrefersColor.ts
index f24e8e8e57..11a2a30ba1 100644
--- a/src/client/theme-api/usePrefersColor.ts
+++ b/src/client/theme-api/usePrefersColor.ts
@@ -86,7 +86,7 @@ class ColorChanger {
    * listen color change
    * @param cb  callback
    */
-  listen(cb: typeof this.callbacks[number]) {
+  listen(cb: (typeof this.callbacks)[number]) {
     this.callbacks.push(cb);
   }
 
@@ -94,7 +94,7 @@ class ColorChanger {
    * unlisten color change
    * @param cb  callback
    */
-  unlisten(cb: typeof this.callbacks[number]) {
+  unlisten(cb: (typeof this.callbacks)[number]) {
     this.callbacks.splice(this.callbacks.indexOf(cb), 1);
   }
 
@@ -137,7 +137,7 @@ export const usePrefersColor = () => {
   useEffect(() => {
     // lazy initialize, for SSR
     colorChanger ??= new ColorChanger({
-      default: themeConfig.prefersColor?.default ?? 'auto',
+      default: themeConfig.prefersColor.default,
     });
     colorChanger.listen(colorChangeHandler);
     setColor(colorChanger.color);
diff --git a/src/client/theme-default/slots/Content/index.less b/src/client/theme-default/slots/Content/index.less
index 9213306f02..8e159ef26a 100644
--- a/src/client/theme-default/slots/Content/index.less
+++ b/src/client/theme-default/slots/Content/index.less
@@ -206,12 +206,4 @@
       margin-bottom: 24px;
     }
   }
-
-  &[data-no-sidebar][data-no-footer] {
-    margin-bottom: @s-content-padding;
-
-    @media @mobile {
-      margin-bottom: 24px;
-    }
-  }
 }
diff --git a/src/client/theme-default/slots/Header/index.tsx b/src/client/theme-default/slots/Header/index.tsx
index ea556c0454..1126c03807 100644
--- a/src/client/theme-default/slots/Header/index.tsx
+++ b/src/client/theme-default/slots/Header/index.tsx
@@ -48,7 +48,7 @@ const Header: FC = () => {
             <SearchBar />
             <LangSwitch />
             <RtlSwitch />
-            {themeConfig.prefersColor?.switch && <ColorSwitch />}
+            {themeConfig.prefersColor.switch && <ColorSwitch />}
             {socialIcons.map((item) => (
               <SocialIcon icon={item.icon} link={item.link} key={item.link} />
             ))}