导航栏定义下拉菜单时出现多余阴影区域

[SwitWu]

请确认

• [ yes] 是当前最新的 Release 版本
• [ yes] 浏览器不属于 IE 等非主流浏览器
• [ yes] 本地 hexo clean && hexo s，并且清除浏览器缓存，仍可复现
• [ yes] 已经排除是其他 Hexo 插件影响

Bug 描述

按配置指南在导航栏中添加下拉菜单，出现多余阴影区域。

复现步骤

该 Bug 复现步骤如下：

1. 按配置指南在导航栏中添加二级菜单，配置如下：

     menu:
       - { key: "home", link: "/", icon: "iconfont icon-home-fill" }
       - { key: "archive", link: "/archives/", icon: "iconfont icon-archive-fill" }
       - { key: "category", link: "/categories/", icon: "iconfont icon-category-fill" }
       - { key: "tag", link: "/tags/", icon: "iconfont icon-tags-fill" }
       - {
         key: "文档",
         icon: "iconfont icon-books",
         submenu: [
           { key: "主题博客", link: 'https://hexo.fluid-dev.com/' },
           { key: "配置指南", link: 'https://hexo.fluid-dev.com/docs/guide/' },
           { key: "文档仓库", link: "/download/" }
         ]
       }
       - { key: "about", link: "/about/", icon: "iconfont icon-user-fill" }
   

2. 博客根目录下运行 hexo clean && hexo serve
3. 打开谷歌浏览器 4000 端口

截图