.courses{
    margin-top: 20px;
    overflow: hidden;
    background: #FFffFF;
}
.title{
    width: 260px;
    height: 60px;
    line-height: 60px;
    color: #333333;
    font-size: 16px;
    float: left;
    padding-left: 20px;
    border-bottom: 1px solid #cfcfcf;
    margin-bottom: 20px;
}
.courses-list{
    float: left;
    padding: 0px 20px;
    margin: 0px;
}
.courses-list li {
    width: 240px;
    height: 150px;
    float: left;
    margin-bottom: 20px;
    
}
.courses-img{
    width: 240px;
    height: 150px;
    overflow: hidden;
}
.courses-img img{
    width: 100%;
    height: 100%;
    transition: ease .5s;
}
.mask {
    width: 240px;
    height: 150px;
    z-index: -1;
    background-color: rgba(0, 0, 0, 0.4);
    position: absolute;
    margin-top: -150px;
}
.link {
    position: absolute;
    width: 36px;
    height: 103px;
    z-index: -1;
    margin-left: 105px;
    margin-top:-90px;
    background: url("/Public/Index/img/icon/link.png") no-repeat center;
    transition: all ease-out 0.5s;
}
.projection {
    width: 238px;
    height: 51px;
    line-height: 51px;
    text-align: center;
    color: #FFffFF;
    background-color: rgba(0, 0, 0, 0.4);
    position: absolute;
    margin-top: -51px;
    font-size: 16px;
    margin-left: 1px;
}
.courses-list li:hover > .link{
    z-index: 99;
    margin-top: 20px;
 }
.courses-list li:hover > .projection{
    display: none;
}
.courses-list li:hover > .courses-img img{
    transform: scale(1.1);
}
.courses-list li:hover > .mask{
    z-index: 2;
}
.border_xian{
    border:1px solid #e8e8e8;height: 30px;width: 100%;
    border-bottom-style: none;
    border-left-style: none;
    border-right-style: none;
}