竖直的图标导航工具栏ui特效
css：hover制作黑色竖直的图标导航工具栏，悬停冒泡文字提示效果。可用于功能性网页工具栏ui布局特效。
(css: hover makes a black vertical icon navigation toolbar, hovering bubbling text prompt effect. It can be used for the ui layout special effects of the functional webpage toolbar.)
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