display:flex;justify-content:center align-item:center
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta charset="utf-8"> <meta name="viewport" content="width=device-width,initial-scale=1.0"> <title></title> <style> *{ padding: 0px; margin: 0px; } body,html{ width: 100%; height: 100%; position: relative; } div{ border: 1px solid black; width: 50%; height: 50%; margin: auto; position: absolute; top: 0; left: 0; bottom: 0; right: 0; } </style> </head> <body> <div></div> </body> </html>
定位 position:fixed;margin:auto;left:0;top:0;right:0;bottom:0;
这问题让我一脸懵,是这个??? *{ margin:auto; padding:auto; }
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