/*special-top*/
.topic-top{
    width: 100%;
    overflow: hidden;
    padding-top: calc(318 / 720 * 100%);
    position: relative;

}
.topic-img-item{
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}
.topic-img-item img{
    display: block;
    width: 100%;
    height: 100%;
}<!--ecms sync check [sync_thread_id="a68f6e271be0d23e820cf6e61402aa0b" sync_date="2023-08-31 17:42:25" check_sum="a68f6e271be0d23e820cf6e61402aa0b  signature="#$enorth_signature_value$#"]-->