.btn-4{overflow:hidden;position:relative;background:#399AEE;padding:10px 15px;color:#fff}.btn-4 span{z-index:20}.btn-4:after{background:#fff;content:"";height:155px;left:-75px;opacity:.2;position:absolute;top:-50px;transform:rotate(35deg);transition:all 0.5s cubic-bezier(0.19, 1, 0.22, 1);width:50px;z-index:15}.btn-4:hover{color:#fff}.btn-4:hover:after{left:120%;transition:all 0.5s cubic-bezier(0.19, 1, 0.22, 1)}.btn-effect{color:#fff;cursor:pointer;position:relative}.btn-effect:hover{text-decoration:none}