.btn{color:#111827;cursor:pointer;z-index:1;background:#fff;border:none;border-radius:.625em;width:100%;height:2em;margin:20px 30px;font-size:18px;font-weight:500;position:relative;overflow:hidden}button:hover{color:#fff}button:after{content:"";z-index:-1;background:#111827;transition:all .5s;position:absolute;inset:0 -20%;transform:skew(-45deg)scaleX(0)}button:hover:after{transition:all .5s;transform:skew(-45deg)scale(1)}