css如何将div实现全屏水平垂直居中，本章节介绍一下如何将一个div元素在整个网页内实现水平垂直居中效果，代码是最有说服力的，直接看代码。
代码如下:
<!DOCTYPE html> <html> <head> <title>css 实现DIV水平垂直居中于屏幕</title><style type="text/css"> body{ margin:0px; padding:0px; } #thediv{ width:100px; height:100px; background:green; position:absolute; left:50%; top:50%; margin-left:-50px; margin-top:-50px;}</style> </head> <body> <div id="thediv"></div></body> </html> 在线运行
以上代码将div在网页中实现了全屏居中效果，下面简单介绍一下它的实现过程。
实现原理:
将div元素设置为绝对定位，然后设置它的left和right属性值分别为50%，这个时候div并没有居中，居中的是div的左上角，所以我们还需要再将其向上和向左拉动一定的距离即可，这个距离分别是高度和宽度的一半。
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