黑色的左侧导航管理面板ui特效
原生js css3制作黑色实用的左侧分类导航管理面板，带图标文字竖直导航菜单ui布局。适用于：功能性和后台管理ui网站模板。
(Native js css3 makes a black and practical left-hand classification navigation management panel, with icon text vertical navigation menu ui layout. Applies to: functional and background management ui website templates.)
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