diff --git a/src/packages/checkbox/demo.vue b/src/packages/checkbox/demo.vue
index 03a6ff8f7420ccf0c1368f4cbba0eb8799b71bff..7230d0b419aed52ce6479c0840f03669ed3d62b6 100644
--- a/src/packages/checkbox/demo.vue
+++ b/src/packages/checkbox/demo.vue
@@ -194,12 +194,6 @@ export default createDemo({
   }
 });
 </script>
-<style>
-#app {
-  height: auto;
-  background: #f6f7f9;
-}
-</style>
 <style lang="scss" scoped>
 .demo-list {
   margin: 57px 0 60px 0;
diff --git a/src/packages/collapse/demo.vue b/src/packages/collapse/demo.vue
index 8688b3d91acac03b164113d7e21f802228b55379..64532fc55609553f50adb9f3d1ba43e1e63506e7 100644
--- a/src/packages/collapse/demo.vue
+++ b/src/packages/collapse/demo.vue
@@ -107,12 +107,6 @@ export default createDemo({
 });
 </script>
 
-<style>
-#app {
-  height: auto;
-  background: #f7f8fa;
-}
-</style>
 <style lang="scss" scoped>
 .demo-list {
   padding-top: 0;
diff --git a/src/packages/radio/demo.vue b/src/packages/radio/demo.vue
index 8a738ed2174670215682afb859a635dd38fd27ae..d45c2e56234c10c94d8759314914db3d150ffda8 100644
--- a/src/packages/radio/demo.vue
+++ b/src/packages/radio/demo.vue
@@ -124,12 +124,6 @@ export default createDemo({
 });
 </script>
 
-<style>
-#app {
-  height: auto;
-  background: #f6f7f9;
-}
-</style>
 <style lang="scss" scoped>
 .demo-list {
   margin: 57px 0 60px 0;