链接
https://stackoverflow.com/questions/8933494/bootstrap-css-containerbefore-display-table
https://www.zhihu.com/question/37004035
https://css-tricks.com/snippets/css/clear-fix/
https://segmentfault.com/q/1010000010108429
http://nicolasgallagher.com/micro-clearfix-hack/
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