.cool-mask{--percentage:200%;mask:radial-gradient(var(--percentage) var(--percentage) at 50% 50%,#000 0,transparent 100%) add;-webkit-mask:radial-gradient(var(--percentage) var(--percentage) at 50% 50%,#000 0,transparent 100%) add}.cool-pattern,:root{--distance:20px}.cool-pattern{animation:movePattern 5s linear infinite;background-image:radial-gradient(#b0b0b0 2px,transparent 0);background-position:-19px -19px;background-position:0 0;background-size:var(--distance) var(--distance)}@keyframes movePattern{0%{background-position:0 30px}to{background-position:var(--distance) 30px}}