night sky

Forked from here

To do:

remake parts with d3.js
adjust conditional CSS

<!DOCTYPE html>
<head>
  <meta charset="utf-8">
 
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.1.1/jquery.min.js"></script>
<
  <script src="https://d3js.org/d3.v4.min.js"></script>
  
  <style>

*, *:after, *:before {
	box-sizing: border-box;
}

body {
	background-color: #000;
	margin: 0;
}

.canvas {
	overflow: hidden;

// relative, absolute
	position: absolute;
    top: 0;
    left: 0;
  right: 0;
  bottom: 0;

.foreground {
    position: absolute;
		top: 0;
		bottom: 0;
		left: 0;
		right: 0;
		background: url('https://www.sketchworld.de/images/trees2.png') repeat-x left bottom;
		background-size: 10%;
    color: white;
    text-align: center;
    padding-top: 20px;
    font-size: 20px;
	}

.sky {
		height: 300%;
		width: 300%;

position: absolute;
		top: -100%;
		left: -100%;
		margin-top: (100% / 2);

background-color: darkblue;
		background:-webkit-radial-gradient(center, rgba(0,0,70,1) 0%, #000 60%);

-webkit-animation: rotate 250s infinite linear;
		-webkit-backface-visibility: hidden;
		-webkit-transform-style: preserve-3d;
	}
}

.star-blink {
	$Size: 7px;

position: absolute;
	width: $Size;
	height: $Size;
	background-color: #b6cbd4;
	border-radius: 50%;
	z-index: 0;

-webkit-transform: rotate(0deg) scale(0.08);
	-webkit-backface-visibility: hidden;
	-webkit-animation: blinkAfter 15s infinite ease-out;
	
	div {
		width: 100%;
		height: 100%;
		border-radius: 50%;
		-webkit-transform: rotate(45deg) scale(0.75);
		box-shadow: 0 0 2px 8px rgba(0,0,0,0.4),
					0 0 2px 9px rgba(255,255,255,0.07),
					0 0 2px 15px rgba(0,0,0,0.4), 
					0 0 2px 16px rgba(255,255,255,0.1);
		-webkit-backface-visibility: hidden;
	}

// NOT Relevant
	//top: 25%;
	//left: 25%;

$height: 800%;

&:after, &:before, div:after, div:before {
		$width: 10%;
		$color: #b6cbd4;

content: '';
		position: absolute;
		display: block;
		top: -($height / 2 - 50%);
		left: (50% - ($width / 2));
		height: $height;
		width: $width;
		border-radius: 50%;
		background-color: $color;
		background:-webkit-linear-gradient(
			top, 
			rgba(255,255,255,0.1) 0%, 
			rgba(255,255,255,0.7) 50%,
			rgba(255,255,255,0.1) 100%);
		z-index: 1;

box-shadow: 0 0 25px white;
		-webkit-backface-visibility: hidden;
	}
	&:after {
	}
	&:before, div:before {
		-webkit-transform: rotate(90deg);
	}
	&.blue {
		&:after, &:before, div:after, div:before {
			box-shadow: 0 0 25px rgba(0,0,255,1);
		}
	}
	&.red {
		&:after, &:before, div:after, div:before {
			box-shadow: 0 0 25px rgba(255,0,0,1);
		}
	}
}

@-webkit-keyframes blinkAfter {
	0% {
		-webkit-transform: rotate(0deg) scale(0.08);
	}
	4% {
		-webkit-transform: rotate(-20deg) scale(0.9);
	}
	8% {
		-webkit-transform: rotate(-40deg) scale(0.08);	
	}
	50% {
		-webkit-transform: rotate(-40deg) scale(0.08);
	}
	52% {
		-webkit-transform: rotate(-50deg) scale(0.3);
	}
	54% {
		-webkit-transform: rotate(-60deg) scale(0.08);
	} 
	100% {
		-webkit-transform: rotate(0deg) scale(0.08);	
	}

}
 @-webkit-keyframes rotate {
	0% {
		-webkit-transform: rotate(0deg);
	}
	100% {
		-webkit-transform: rotate(360deg);	
	}
}

</style>

</head>

var amount = 800;
 var sky = $('.sky');

for (var i = 0 ; i < amount ; i++ ) {
	var s = $('<div class="star-blink"><div></div></div>');
	s.css({
		'top': Math.random() * 100 + '%',
		'left': Math.random() * 100 + '%',
		'animation': 'blinkAfter 15s infinite ' + Math.random() * 100 + 's ease-out',
		'width': Math.random() * 2 + 7 + 'px',
		'height': Math.random() * 2 + 7 + 'px',
		'opacity': Math.random() * 5 / 10 + 0.5
		});
	if (i % 8 === 0) {
		s.addClass('red');
	} else if (i % 10 === 6) {
		s.addClass('blue');
	}
	sky.append(s);
}
 
    
  </script>

</body>

https://ajax.googleapis.com/ajax/libs/jquery/3.1.1/jquery.min.js

https://d3js.org/d3.v4.min.js