.grow-from-middle>a::before{content:" ";background-color:var(--primary);position:absolute;bottom:0;transform:translateY(50%);left:50%;right:50%;height:2px;transition:left 0.5s,right 0.5s}.grow-from-middle>a:hover::before,.grow-from-middle>a.one-page-link--active::before{left:0%;right:0%}