<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/> <title></title> <style type="text/css"> img{ position: absolute; top:50%; left:50%; transform: translate(-50%,-50%); } </style> </head> <body> <form id="form1" runat="server"> <img alt="" src="/images/qhfgs@2x.png" /> </form> </body> </html>
单纯水平居中可以使用
margin:0 auto；100px