.home-banner{
    width: 100%;
    max-width: 1920px;
    height: 476px;
    margin: 55px auto 0;
    position: relative;
    overflow: hidden;
}
.home-banner img{
    width: 1920px;
    height: 476px;
    position: absolute;
    top: 0;
    left: 50%;
    margin-left: -960px;
}
.banner-intro{
    width: 1180px;
    height: 476px;
    position: absolute;
    top: 0;
    left: 50%;
    margin-left: -590px;
}
.banner-intro h1{
    font-size: 40px;
    line-height: 52px;
    color: #3D4059;
    margin-top: 113px;
}
.banner-intro h2{
    font-size: 18px;
    line-height: 38px;
    color: #777993;
}
.banner-intro .join-btn{
    display: block;
    width: 238px;
    height: 85px;
    background: url(//image.zhihuishu.com/zhs_yufa_150820/ablecommons/demo/201809/4e03d1e9263e456182967cdf7f9062bf.png) no-repeat;
    line-height: 75px;
    text-align: center;
    font-size: 20px;
    color: #fff;
}
.banner-intro .join-btn:hover{
    text-decoration: none;
    background-position: 0 -111px;
}
.banner-intro .join-btn:active{
    background-position: 0 -222px;
}
.banner-intro .join-btn span{
    vertical-align: middle;
}
.banner-intro .join-btn em{
    display: inline-block;
    width: 9px;
    height: 16px;
    background: url(//image.zhihuishu.com/zhs_yufa_150820/ablecommons/demo/201809/c80b62b79d374d6c9828ae0d647cbcd1.png) no-repeat;
    vertical-align: middle;
    margin-left: 9px;
}
.course-wrap-tit{
    width: 1180px;
    height: 83px;
    margin: 18px auto 0;
}
.course-wrap-tit .icon{
    display: inline-block;
    width: 86px;
    height: 83px;
    background: url(//image.zhihuishu.com/zhs_yufa_150820/ablecommons/demo/201809/85ad3b826329404bbc0ebe7e96b7606f.png) no-repeat;
    vertical-align: middle;
}
.course-wrap-tit dl{
    display: inline-block;
    vertical-align: middle;
    margin-left: 16px;
}
.course-wrap-tit dl dt{
    font-size: 26px;
    color: #3D4059;
    line-height: 36px;
}
.course-wrap-tit dl dd{
    font-size: 12px;
    color: #777993;
    line-height: 20px;
}
.course-list-wrap{
    width: 1300px;
    margin: 30px auto;
}
.course-list-wrap li{
    width: 285px;
    float: left;
    margin: 0 20px 25px;
    background: #fff;
    border-radius: 6px; 
    transition: all .2s ease-in;
}
.course-list-wrap li:hover{
    box-shadow: 0 2px 15px 0 rgba(129,135,159,0.23);
}
.course-list-wrap li a:hover{
    text-decoration: none;
}
.course-list-wrap li img{
    width: 285px;
    height: 160px;
    object-fit: cover;
    border-radius: 6px;
}
.course-list-wrap li .course-name{
    padding: 0 15px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    margin-top: 17px;
    line-height: 22px;
    color: #3D4059;
    font-size: 16px;
}
.course-list-wrap li .school-teacher-info{
    padding: 0 15px;
    margin-top: 11px;
    line-height: 16px;
    color: #a1a2b2;
    margin-bottom: 50px;
}
.course-list-wrap li .school-teacher-info span{
    color: #777993;
}