.container {
    width: 1000px;
    margin: 0 auto;
    overflow: hidden;
}
.header {
    overflow: hidden;
    background: #fff;
    border: 1px solid #eee;
    border-radius: 0 0 4px 4px;
}
.banner {
    overflow: hidden;
    width: 100%;
    height: 0;
    padding-bottom: 24%;
    background: url(/imgs/banner.jpg);
    background-size: contain;
}
.dell {
    position: relative;
    height: 150px;
    padding: 0 20px;
}
.avatar {
    position: absolute;
    top: -30px;
    width: 170px;
    height: 170px;
    background: #fff;
    border-radius: 5px;
}
.avatar-img {
    display: block;
    width: 160px;
    height: 160px;
    margin: 5px;
}
.dell-name {
    overflow: hidden;
    position: absolute;
    left: 220px;
    top: 16px;
    line-height: 30px;
}
.name-title {
    display: block;
    float: left;
    font-size: 26px;
    font-weight: bold;
}
.name-desc {
    display: block;
    float: left;
    position: relative;
    top: 2px;
    margin-left: 20px;
    font-weight: normal;
    font-size: 18px;
}
.name-desc-sub {
    font-size: 14px;
    margin-left: 10px;
}
.dell-desc {
    overflow: hidden;
    position: absolute;
    margin-right: 20px;
    left: 220px;
    top: 56px;
    line-height: 20px;
    color: #8590a6;
    font-size: 12px;
}
.content {
    margin: 10px 0;
    padding-bottom: 10px;
    float: right;
    width: 1000px;
    background: #fff;
    border-radius: 2px;
    box-shadow: 0 1px 3px rgba(26, 26, 26, .1);
    box-sizing: border-box;
}
.course {
    overflow: hidden;
}
.course-link {
    color: #07111B;
}
.course-link:hover {
    color: #ec1500;
}
.course-item {
    width: 250px;
    float: left;
}
.course-img {
    width: 212px;
    height: 118px;
    margin: 19px 10px 0 19px;
    border-radius: 5px;
}
.course-desc {
    line-height: 20px;
    font-size: 14px;
    padding: 5px 19px;
}