.piece{margin:15px;width:200px;height:180px}.piece:hover{background-color:#ec220d}.picec_default{background-color:#919199}.picec_select{background-color:#ec220d}.el-tag{margin-left:2px;margin-right:2px;line-height:24px;height:24px}.courseItem{margin:10px;padding:10px}.courseItem img{width:240px;height:130px}.teacherItem{margin:10px 15px 10px 15px;padding:10px}.teacherItem img{height:200px;width:160px;border-radius:10px}.video_item{width:30%;margin:20px 30px 20px 0;color:#fff}.video_item img{height:80%}.video_name{padding-top:10px;padding-bottom:10px;font-size:18px;font-weight:600;background-color:#0d7bd9}