background:
radial-gradient(at 20% 20%, #fde68a 0%, transparent 70%),
radial-gradient(at 80% 20%, #fca5a5 0%, transparent 70%),
radial-gradient(at 20% 80%, #fde68a 0%, transparent 70%),
radial-gradient(at 80% 80%, #fde68a 0%, transparent 70%);