:root { color: white; font-family:sans-serif } .glass { background: rgba(128, 128, 128, 0.35); box-shadow: 0 4px 30px rgba(0, 0, 0, 0.1); border-radius: 3em; padding: 1em 2em; } .sunset { background: linear-gradient(45deg, gold 2%, purple); margin: 0px; animation: gradient 35s linear infinite; background-size: 180% 180%; height: 100vh; width: 100vw; position: fixed; z-index: -1; top:0; left:0; } @keyframes gradient { 0% { background-position: 0% 50%; } 50% { background-position: 100% 50%; } 100% { background-position: 0% 50%; } }