By Noxxxx from https://interview.noxxxx.com/?post_type=post&p=114 上山打老虎
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圣杯布局

See the Pen 圣杯布局 by hjoker (@hjoker) on CodePen.

双飞翼布局

See the Pen 双飞翼布局 by hjoker (@hjoker) on CodePen.

手写 clearfix

.clearfix:after {
    content: '';
    display: table;
    clear: both;
}