fix: 头部样式修改

src/global.less

@@ -38,13 +38,7 @@ body,
 .ant-menu-dark .ant-menu-sub,
 .ant-menu.ant-menu-dark,
 .ant-menu.ant-menu-dark .ant-menu-sub {
-  background: linear-gradient(
-    to right,
-    #584475 0%,
-    #7c62a4 50%,
-    #7c62a4 50%,
-    #584475 100%
-  ) !important;
+  background: none !important;
 }
 .ant-menu-dark .ant-menu-inline.ant-menu-sub {
   background: #ffffff;