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<div class="responsive-box"></div> <style> .responsive-box { width: 50vw; height: 50vw; background-color: green; animation: resize 4s infinite; } @keyframes resize { 0% { width: 50vw; height: 50vw; } 50% { width: 70vw; height: 70vw; } 100% { width: 50vw; height: 50vw; } } </style>