.yk-source-material-new .teach-book{position:relative;height:100%;border-radius:10px}.yk-source-material-new .teach-book img{width:329px;height:250px;border-radius:10px}.yk-source-material-new .teach-book .teach-book-p{position:absolute;left:0;bottom:18px;width:100%;text-align:center;color:#fff;font-size:20px}.yk-source-material-new .close-material-btn{margin-right:100px}