article a{font-size:21px;font-weight:600;color:#009688;text-decoration:none;position:relative}article a::before{content:"";position:absolute;width:0;height:2px;bottom:0;left:0;background-color:#009688;visibility:hidden;transition:all .3s ease-in-out}article a:hover::before{visibility:visible;width:100%}