style: 更新内容滚动区域样式

public/themes/dist_static/static/css/common.css

@@ -1304,9 +1304,13 @@ body {
   box-shadow: 0 1.5rem 3rem rgba(46, 53, 58, 0.08);
   transition: grid-template-rows 0.5s var(--easing);
 }.nav-mega__inner {
-  overflow: hidden;
+  overflow: auto;
   min-height: 0;
-}.site-header__nav-item:hover .nav-mega__inner {
+}
+.nav-mega__inner::-webkit-scrollbar {
+  display: none;
+}
+.site-header__nav-item:hover .nav-mega__inner {
   overflow-y: auto;
   overscroll-behavior: contain;
   -webkit-overflow-scrolling: touch;