一张图说明DIV盒子距离
https://images2017.cnblogs.com/blog/703052/201802/703052-20180201144341640-322791707.png虚线的宽高为你实际指定的width和height虚线外的白色区域为padding红色区域为border的width红色外的区域为margin
{:soso__10615784733045253186_1:} {:soso__6468533990763016983_4:} {:soso__15697946629047335275_3:}
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