.btn{border:1px solid #02a881;color:#000;overflow:hidden;position:relative}.btn,.btn:before{transition:all .4s ease-in-out 0s}.btn:before{background-color:#02a881;border-radius:1.5rem;content:"";height:100%;left:0;position:absolute;top:0;width:100%;z-index:-1}@media screen and (min-width:720px){.btn-hover:hover:before{left:0;width:45px}}