li{display:inline-block;min-width:50px}li a{line-height:40px;color:rgba(0,0,0,0.8);text-decoration:none;padding:0.8rem}li a:after{content:'';display:block;margin:auto;height:2px;width:0;background:transparent;transition:width .5s ease,background-color .5s ease}li a:hover:after{width:100%;background:rgba(0,0,0,0.8)}