.nav-link{transition:color var(--transitions-speed);text-decoration:none;position:relative}.nav-link:hover{color:var(--primary-color)}.nav-link:after{content:"";transition:opacity var(--transitions-speed);background-color:var(--primary-color);opacity:0;width:100%;height:5px;position:absolute;bottom:-5px;left:0}.nav-link:hover:after{opacity:1}