发布时间: 2018-03-29 07:16:00
参考: (竖直居中: ) https://stackoverflow.com/a/22218694,
底部固定:https://css-tricks.com/snippets/css/fixed-footer/
铺满全屏: height: 100vh https://stackoverflow.com/questions/1575141/how-to-make-a-div-100-height-of-the-browser-window
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