html, body {
    width: 100%; 
    height: 100%; 
    font-size: 16px;
    margin: 0; 
    padding: 0; 
    overflow: hidden;
    font-family:"Microsoft YaHei";
}

.header {
    position:absolute;
    top:0;
    width:100%;
    height:70px; 
    padding-top:6px;
    overflow:hidden;
}
.header .return_btn {
    position:absolute; 
    left:5px;
    padding-top:6px; 
    height:70px;
    padding-left:20px;
    padding-right:20px;
    text-indent:-9999px;
    background:url(../images/common/header_return.png) no-repeat 10px 26px;
    background-size:22px 22px;
}
.header h2 {
    text-align:center; 
    margin:0; 
    line-height:74px; 
    padding:0; 
    color:#000;
    font-weight:normal; 
    font-size:22px;
}