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HTML

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CSS

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CSS Base

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JavaScript

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JavaScript preprocessors can help make authoring JavaScript easier and more convenient. For instance, CoffeeScript can help prevent easy-to-make mistakes and offer a cleaner syntax and Babel can bring ECMAScript 6 features to browsers that only support ECMAScript 5.

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Babel is required to process package imports. If you need a different preprocessor remove all packages first.

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HTML 

              
                - var lights = 150;

h1 Merry Christmas

.bokeh
  - for (var i = 0; i < lights; i++)
    .light
!

CSS 

              
                /* Font */
@import url(https://fonts.googleapis.com/css?family=Montserrat);

/* Colors */
$colorCollection: (#D00010, #FEC641, #63C13B, #FE0016, #5C6C94, #6B0D05, #7D0006, #DB1913, #FEE34A, #2F8A27);
// $colorCollection: (#F4A43B, #0AB1AA, #FDFEE4, #F42618, #ADFEDD, #FF5F24, #FEF14F, #FD361B, #30398D, #FEE086);
// $colorCollection: (#FCF1BD);

/* Config */
$lights: 150; // match lights in mark up
$textColor: #FFFFFF;
$totalAnimation: 5;
$lightSize: 75;
$blurLevel: 2;

/* Pretty Lights */
.bokeh{
	position: relative;
	width: 100%;
	height: 100%;
	pointer-events: none;
	top: -50px;
  left: -25px;
}

.light{
	position: absolute;
	border-radius: 50%;
	opacity: 0;
}

@for $i from 1 through $lights{
	$lightWidth: $lightSize + random(25);
	$lightHeight: $lightWidth;
	$lightVertical: random(100);
	$lightHorizontal: random(100);
	$lightBlur: $blurLevel + random($blurLevel);
	$lightDelay: 10 + random(25);
	$animation: 1 + random($totalAnimation);

	.light:nth-child(#{$i}){
		width: $lightWidth + px;
		height: $lightHeight + px;
		top: #{$lightVertical + "%"};
		left: #{$lightHorizontal + "%"};
		background: nth($colorCollection, random(length($colorCollection)));
     filter: blur($lightBlur + px);
		animation: #{$lightDelay + s} #{"light" + $animation} linear infinite;
	}
}

@for $i from 1 through $totalAnimation{
	@keyframes light#{$i} {
		25%{
			opacity: (25 + random(50)) * 0.01;
		}
		50%{
			opacity: 0;
		}
		75%{
			opacity: (25 + random(50)) * 0.01;
		}
		100%{
			opacity: 0;
		}
	}
}


/* Other Stuff */
body, html{
	margin: 0;
	padding: 0;
	width: 100%;
	height: 100%;
	overflow: hidden;
	font-family: 'Montserrat', sans-serif;
	background-image: linear-gradient(right bottom, #0A0707 0%, #110C0D 50%, #0C090A 100%);
}

h1 {
	text-align: center;
	text-transform: uppercase;
	text-shadow: 0px 0px 50px rgba($textColor, 0.5);
	color: $textColor;
	position: absolute;
	top: 25%;
	z-index: 10;
	opacity: 0.9;
	left: 0%;
	right: 0%;
}
!

JS 

              
                // Merry Christmas

// Try the different color collections
// Uncomment $colorCollection in SCSS

// View my snow pen that uses similar code:
// https://codepen.io/YoEmanYo/pen/owAnm
!
999px

Console