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*{margin:0px;padding:0px;list-style:none;} #bkg{ width:100%; height:100%; background:url(https://timgsa.baidu.com/timg?image&quality=80&size=b9999_10000&sec=1508329245451&di=6e6032acf8c4c1e0a1fd459437f91334&imgtype=0&src=http%3A%2F%2Ffe.topitme.com%2Fe%2Ffa%2F23%2F1124393450dfc23faeo.jpg) no-repeat center; } #main{ width:500px; height:300px; position:absolute; overflow:hidden; left:50%; margin-left:-250px; top:50%; margin-top:-150px; } #form{ width:100%; text-align:center; } h1{ width:100%; height:50px; text-align:center; margin-bottom:50px; }
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