.wl {
    position: relative;
    z-index: 1;
    padding-top:20px;
    margin:20px;}
.teach-detail:hover .wl::after{
    background:#fff;}
.wl::after {
    content: "";
    z-index: -1;
    position: absolute;
    left: 0px;
    width: 80px;
    height: 3px;
    background: #1a4379;
    bottom: -1.5px;}
::after, ::before {
    transition: 0.5s;}
.l3 {
    overflow: hidden;
    text-overflow: ellipsis;
    display: -webkit-box;
    -webkit-line-clamp: 3;}