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Holiday Christmas Lights Animation Tutorial CSS JavaScript

Published : April 1, 2017   •   Last Edited : November 24, 2025   •   Author : Adam Khoury

Learn to design, animate and render a set of holiday light bulbs using CSS and JavaScript.

Lesson Code 
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<style>
body { background:#000; }
.bulb {
	width: 40px;
	height: 40px;
	display: inline-block;
	margin: 0px 10px;
	border-radius: 100% 4px;
	transform: rotate(-45deg);
}
.bulb:nth-child(odd) {
	background: #6CB6FF;
	opacity: 1;
	box-shadow: 1px 1px 15px #6CB6FF, -1px -1px 15px #6CB6FF;
	animation: bulb-pulse-1 0.8s linear 0s infinite alternate;
}
.bulb:nth-child(even) {
	background: #0C0;
	opacity: .3;
	box-shadow: none;
	animation: bulb-pulse-2 0.8s linear 0s infinite alternate;
}
@keyframes bulb-pulse-1 {
	from { box-shadow: 1px 1px 15px #6CB6FF, -1px -1px 15px #6CB6FF; opacity: 1; }
	to { box-shadow: none; opacity: .3; }
}
@keyframes bulb-pulse-2 {
	from { box-shadow: none; opacity: .3; }
	to { box-shadow: 1px 1px 15px #0C0, -1px -1px 15px #0C0; opacity: 1; }
}
</style>
</head>
<body>
<div id="lights"></div>
<script>
for(var i=0; i < 10; i++){
	var bulb = document.createElement("div");
	bulb.className = "bulb";
	// var rand = Math.floor(Math.random() * 180) + 1;
	// bulb.style.transform = "rotate("+rand+"deg)";
	document.getElementById("lights").appendChild(bulb);
}
</script>
</body>
</html>
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