User:AlexTech01/snowflake.css

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This user script seems to have a documentation page at User:AlexTech01/snowflake and an accompanying .js page at User:AlexTech01/snowflake.js.

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.snowflake {
	position: fixed;
	top: -10px;
    z-index: 9999;
    opacity: 0.9;
    color: #99c4ce;
    animation-name: fall;
    animation-duration: 10s;
    animation-timing-function: linear;
    animation-iteration-count: infinite;
    pointer-events: none;
}

@keyframes fall {
	to {
		transform: translateY(100vh);
	}
}