body{margin:0;min-height:100vdh}.border-mask{position:absolute;top:0;left:0;border-radius:8px;width:100%;height:100%;padding:2px;mask:linear-gradient(#000 0 0) content-box,linear-gradient(#000 0 0) border-box;-webkit-mask-composite:xor;mask-composite:exclude}.glow{background:conic-gradient(from 0deg,transparent,#fff 10%,#000 15%,transparent);position:absolute;top:50%;left:50%;width:500px;height:500px;transform:translate(-50%,-50%);transform-origin:0 0;animation:rotateShine 3s linear infinite}@keyframes rotateShine{0%{transform:rotate(0) translate(-50%,-50%)}to{transform:rotate(360deg) translate(-50%,-50%)}}