.teach{
	width:100%;
	background:#efefef;
	height:100%;
}
.teach_ul{
	width:1200px;
	background:#fff;
	border-radius:10px;
    margin: auto;
    height: 540px;
    padding: 30px;
position: relative;
    top: 41px;
}
.teach_ul li{
    width: 280px;
    height: 201px;
    float: left;
    border: 1px solid #e7e7e7;
    border-radius: 5px;
    margin-left: 14px;
    margin-top: 17px;
    font-size: 19px;
}
.teach_ul li a{
	display:block;
}
.teach_ul li p{
	text-align:center;
}
.clear{
	clear:both;
}
.pre_dh{
	font-size: 26px;
    margin: 30px auto;
    padding-left: 14px;
}