.pulsing-circle{position:fixed;top:50%;left:50%;width:100px;height:100px;background-color:rgba(0,21,4,.5);border-radius:50%;transform:translate(-50%,-50%) scale(1);animation:pulse 10s ease-in-out infinite}@keyframes pulse{0%,to{transform:translate(-50%,-50%) scale(1)}50%{transform:translate(-50%,-50%) scale(10)}}