.center { width: 1000px; margin: 50px auto; }
.main header { height: 100px; background-color: transparent; position: fixed; top: 0; left:50%; margin-left:-590px; zoom: 1;overflow: hidden; z-index: 999;}
header .logo a{ width: 153px;height: 41px; background: url("../img/logo.png") no-repeat; float: left; margin-top: 26px; }
header ul li { list-style: none; }
header ul { zoom: 1; overflow: hidden; float: right; margin-top: 36px; }
header ul li { float: left; margin-left: 25px;}
header li a { color: #fff; font-size:18px; text-decoration: none;}
header .register a{ width: 73px; height: 25px; line-height:25px; text-align:center; display:block; background-color: #fff; color: #0080d7; font-size: 14px;  -webkit-border-radius: 4px;  -moz-border-radius: 4px;  border-radius: 4px;}
.header {  height: 100px; background-color: transparent; position: relative; top: 0; left:50%; margin-left:-590px; zoom: 1;overflow: hidden;    z-index: 999;}
.header .logo a{ width: 153px;height: 41px; background: url("../img/logo-blue.png") no-repeat; float: left; margin-top: 26px;}
.header ul li { list-style: none; }
.header ul { zoom: 1; overflow: hidden; float: right; margin-top: 36px; }
.header ul li { float: left; margin-left: 25px;}
.header li a { color: #333; font-size:18px; text-decoration: none;}
.header .register a{ width: 73px; height: 25px; line-height:25px; text-align:center; display:block; background-color: #0080d7; color: #fff; font-size: 14px;  -webkit-border-radius: 4px;  -moz-border-radius: 4px;  border-radius: 4px;}