小米简单导航
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<a href="">小米商城</a><span>|</span>
<a href="">MIUI</a><span>|</span>
<a href="">loT</a><span>|</span>
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<a href="">金融</a><span>|</span>
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<a href="" class="header_a" ><i class="fa fa-shopping-cart"></i> 购物车（0）</a>
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</html>老师我想问下，购物车那款单独做鼠标经过颜色字体改变，我做不了。只能继承a的经过颜色白色。这个要怎么改啊。