CSS 清除浮动

<style>
.clearfix:after{
        visibility: hidden;
        display: block;
        font-size: 0;
        content: ".";
        clear: both;
        height: 0;
}

* html .clearfix{zoom: 1;}

*:first-child + html .clearfix{zoom: 1;}

</style>

<div class="clearfix" style="border: 2px solid red;">
    <div style="float: left;  80px; height: 80px; border: 1px solid blue;">
        空山幽泉
    </div>
</div>