.article_pic a{position:relative;display:inline-block;text-decoration:none}.article_pic{text-align:center}.article_pic a::after{position:absolute;bottom:0px;left:0;content:'';width:100%;height:2px;background:#333;opacity:0;visibility:hidden;transition:.3s}.article_pic a:hover::after{bottom:0px;opacity:1;visibility:visible}