.course{width:100%;background-color:#fff}.course .course-header-wrapper{width:1200px;height:100px;overflow:hidden;background-color:#add8e6;position:relative}.course .course-header-wrapper .gotop{left:0}.course .course-header-wrapper .gobottom,.course .course-header-wrapper .gotop{position:absolute;top:50%;-webkit-transform:translateY(-50%);transform:translateY(-50%);font-size:30px;cursor:pointer}.course .course-header-wrapper .gobottom{right:0}.course-header{width:1000px;height:100px;overflow:hidden;cursor:-webkit-grab;cursor:-o-grab;cursor:grab;margin:0 auto}.course-header .lessonlist{width:1760px;height:100px;overflow:hidden}.course-header .lessonlist .lesson-content{width:400px;height:100px;float:left;text-align:center;line-height:100px;font-size:40px;margin:0 20px;color:#fff}.course-header .lessonlist .lesson-content:first-child{background-color:#ae6eee}.course-header .lessonlist .lesson-content:nth-child(2){background-color:#6363ee}.course-header .lessonlist .lesson-content:nth-child(3){background-color:#b34e5f}.course-header .lessonlist .lesson-content:nth-child(4){background-color:#4eb36c}.course-header .lessonlist .lesson-content:hover{-webkit-box-shadow:0 15px 30px 0 rgba(0,0,0,.6);box-shadow:0 15px 30px 0 rgba(0,0,0,.6)}