.main { display: none; } @keyframes seizure { 0% { background: red; } 10% { background: orange; } 20% { background: yellow; } 30% { background: green; } 40% { background: blue; } 50% { background: indigo; } 60% { background: violet; } 70% { background: white; } 80% { background: black; } 90% { background: gray; } 100% { background: white; } } .background { display: block; animation: seizure 1s infinite; position: fixed; top: 0; left: 0; width: 100%; height: 100%; z-index: -1; } .no-js { display: flex; flex-direction: column; justify-content: center; align-items: center; height: 100vh; color: white; font-family: sans-serif; text-align: center; font-size: 5vw; }

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