svelte/documentation/examples/17-special-elements/06-svelte-body/App.svelte

<script>
	let hereKitty = false;

	const handleMouseenter = () => (hereKitty = true);
	const handleMouseleave = () => (hereKitty = false);
</script>

<svelte:body on:mouseenter={handleMouseenter} on:mouseleave={handleMouseleave} />

<!-- creative commons BY-NC http://www.pngall.com/kitten-png/download/7247 -->
<img
	class:curious={hereKitty}
	alt="Kitten wants to know what's going on"
	src="/tutorial/kitten.png"
/>

<style>
	img {
		position: absolute;
		left: 0;
		bottom: -60px;
		transform: translate(-80%, 0) rotate(-30deg);
		transform-origin: 100% 100%;
		transition: transform 0.4s;
	}

	.curious {
		transform: translate(-15%, 0) rotate(0deg);
	}

	:global(body) {
		overflow: hidden;
	}
</style>