diff --git a/site/theme/template/Layout/Header/Navigation.less b/site/theme/template/Layout/Header/Navigation.less
index a3012deef4..a5e5ffcb36 100644
--- a/site/theme/template/Layout/Header/Navigation.less
+++ b/site/theme/template/Layout/Header/Navigation.less
@@ -13,6 +13,7 @@
 
     & > .ant-menu-item,
     & > .ant-menu-submenu {
+      min-width: 40px;
       height: @header-height;
       margin-right: 12px;
       margin-left: 12px;