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reset.css html, body, div, span, object, iframe,h1, h2, h3, h4, h5, h6, p, blockquote, pre,abbr, address, cite, code,del, dfn, em, img, ins, kbd, q, samp,small, strong, sub, sup, var,b, i,dl, d...

CSS 面试题——盒子水平垂直居中方法一：通过定位(三种方法)1、已知盒子宽高 html,body{ margin: 0; padding: 0; height: 100%; position: relative; } .box{ width: 600px; height: 400...