.clear{
    zoom:1;
}  /*.//为了兼容性，因为ie6/7不能使用伪类，所以加上此行代码。*/
.clear:after{
    clear:both;
    content:'';
    display:block;
    width:0;
    height:0;
    visibility:hidden;
}

.active_color{
    background-color: #1296db;
    color: #ffffff;
}
body{
    overflow-x: hidden;
}