/*放置整站通用的样式*/
.clear:after{
    content: ".";
    display: block;
    clear: both;
    height: 0;
    overflow: hidden;
}

.clear {
    *zoom: 1;
}

.wraper{
    width: 1200px;
    margin: 0 auto;
}

.mt20{
    margin-top: 20px;
}

.mt30{
    margin-top: 30px;
}
.mt40{
    margin-top: 40px;
}

.ml20{
	margin-left: 20px;
}