.bg_btn{background:#000;border:3px solid #fff;color:#fff;transition:.5s,transform .3s cubic-bezier(.4,0,.2,1);padding:8px 35px;border-radius:30px;font-size:17px;font-weight:600;display:inline-block;position:relative;z-index:1;overflow:hidden}.bg_btn:before{content:"";z-index:-1;position:absolute;top:50%;left:100%;margin:-15px 0 0 1px;width:15%;height:30px;border-radius:50%;background:#22d3a0;transform-origin:100% 50%;transform:scaleY(2);transition:transform .3s,opacity .3s;transition-timing-function:cubic-bezier(.7,0,.9,1)}.bg_btn:hover:before{transform:scale3d(9,9,1)}.bg_btn:focus,.bg_btn:hover{color:#000;border-color:#22d3a0;background:#22d3a0;transform:scale(1.07)}