a{
    text-decoration: none !important;
}
.topics-title-pic{
    display: block;
    width: 95.3vw;
    height: 7.7vw;
    border-radius: .7vw;
    margin: 0 auto;
}
.topics-ppt-list{
    position: relative;
    width: 95.3vw;
    height: auto;
    margin: 0 auto;
    padding-bottom: 3vw;
    top: 1vw;
}
.topics-detail-l{
    margin-left: calc(1.5vw - 6.2px);
}