.box{ width: 100px; height: 100px; border-radius: 50%; box-shadow: 0 0 0 10000px -sharp000; background-color: transparent; animation: border_shrink 1s; } @keyframes border_shrink { 0% { width: 100px; height: 100px; } 100% { width: 0; height: 0; } }
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