.link-underline{background-image:linear-gradient(transparent,transparent),linear-gradient(#ffb805,#ffb805);background-position:0 100%;background-repeat:no-repeat;background-size:0 3px;border-bottom-width:0;transition:background-size .5s ease-in-out}.link-underline:hover{background-position:0 100%;background-size:100% 3px}