fix(layout): overflow on horizontal direction

CHANGELOG.en-US.md

@@ -1,5 +1,11 @@
 # CHANGELOG
 
+## Pending
+
+### Fixes
+
+- Fix `n-layout` overflow on horizontal direction.
+
 ## 2.7.1
 
 # Feats

CHANGELOG.zh-CN.md

@@ -1,8 +1,14 @@
 # CHANGELOG
 
+## Pending
+
+### Fixes
+
+- Fix `n-layout` 横向溢出的问题
+
 ## 2.7.1
 
-# Feats
+### Feats
 
 - `n-checkbox` 增加 `focusable` 属性
 - `n-cascader` 增加 `action` slot

src/layout/src/styles/layout.cssr.ts

@@ -10,17 +10,14 @@ export default cB('layout', `
   position: relative;
   z-index: auto;
   flex: auto;
+  overflow-x: hidden;
   transition:
     margin-left .3s var(--bezier),
     background-color .3s var(--bezier),
     color .3s var(--bezier);
 `, [
-  cE('content', `
-    box-sizing: border-box;
-    overflow-x: hidden;
-  `),
   cM('has-sider', [
-    c('& >', [
+    c('>', [
       cE('content', `
         display: flex;
         flex-wrap: nowrap;