#top-menu li a{position:relative}#top-menu li a:after{content:"";position:absolute;bottom:-5px;left:0;width:0;height:2px;background:#000;transition:width 0.3s ease}#top-menu li a:hover:after{width:100%}#top-menu li a{position:relative}#top-menu li a:after{content:"";position:absolute;bottom:-5px;left:0;width:0;height:2px;background:#000;transition:width 0.3s ease}#top-menu li a:hover:after{width:100%}