*, html, body {
	box-sizing: border-box;
	margin: 0;
	padding: 0;
}

body { 
	background: radial-gradient(circle at -16% -16%, hotpink, slateblue);
	display: grid;
	height: 100vh;
	place-items: center; 
}

body::before {
	animation: anim 30s infinite;
	background: radial-gradient(circle at 0% 0%, hotpink, slateblue);
	border-radius: 30% 70% 53% 47% / 26% 46% 54% 74%;
	box-shadow: 0 -2vmin 4vmin LightPink inset, 0 1vmin 4vmin MediumPurple inset,
		0 -2vmin 7vmin purple inset;
	content: "";
	filter: drop-shadow(0 0 3vmin Thistle) drop-shadow(0 5vmin 4vmin Orchid)
		drop-shadow(2vmin -2vmin 15vmin MediumSlateBlue)
		drop-shadow(0 0 7vmin MediumOrchid);
	height: 50vmin;
	position: absolute;
	width: 50vmin;
}

@keyframes anim {
	0%,
	100% {
		border-radius: 30% 70% 70% 30% / 30% 52% 48% 70%;
		box-shadow: 0 -2vmin 4vmin LightPink inset, 0 -4vmin 4vmin MediumPurple inset,
			0 -2vmin 7vmin purple inset;
	}

	10% {
		border-radius: 50% 50% 20% 80% / 25% 80% 20% 75%;
	}

	20% {
		border-radius: 67% 33% 47% 53% / 37% 20% 80% 63%;
	}

	30% {
		border-radius: 39% 61% 47% 53% / 37% 40% 60% 63%;
		box-shadow: 0 -4vmin 8vmin hotpink inset, -1vmin -2vmin 6vmin LightPink inset,
			-1vmin -2vmin 4vmin MediumPurple inset, 1vmin 4vmin 8vmin purple inset;
	}

	40% {
		border-radius: 39% 61% 82% 18% / 74% 40% 60% 26%;
	}

	50% {
		border-radius: 100%;
		box-shadow: 0 4vmin 16vmin hotpink inset, 0 2vmin 5vmin LightPink inset, 0 4vmin 4vmin MediumPurple inset,
			0 6vmin 8vmin purple inset;
	}

	60% {
		border-radius: 50% 50% 53% 47% / 72% 69% 31% 28%;
	}

	70% {
		border-radius: 50% 50% 53% 47% / 26% 22% 78% 74%;
		box-shadow: 1vmin 1vmin 8vmin LightPink inset,
			2vmin -1vmin 4vmin MediumPurple inset, -1vmin -1vmin 16vmin purple inset;
	}

	80% {
		border-radius: 50% 50% 53% 47% / 26% 69% 31% 74%;
	}

	90% {
		border-radius: 20% 80% 20% 80% / 20% 80% 20% 80%;
	}
}

External CSS

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