.wave-btn:before{content:"";position:absolute;width:320px;height:320px;border-radius:50%;background-color:var(--light);top:100%;left:50%;transform:translate(-50%);transition:all 1s;animation:wave 5s linear infinite}.wave-btn:hover:before{border-radius:130px;top:50%}@keyframes wave{0%{transform:translate(-50%) rotate(-180deg)}to{transform:translate(-50%) rotate(1turn)}}