.btn{cursor:pointer;border:none;outline:none;position:relative;overflow:hidden}.btn span{opacity:0;background-color:#ffffff26;border-radius:50%;width:100px;height:100px;margin-top:-50px;margin-left:-50px;animation:1s ripple;position:absolute}@keyframes ripple{0%{opacity:1;transform:scale(0)}to{opacity:0;transform:scale(10)}}