SOURCE

var cols = ['#f5d76e','#f7ca18','#f4d03f','#ececec','#ecf0f1','#a2ded0'];
var stars = 500;

for (var i = 0; i <= stars; i++) {

	var size = Math.random()*5;
  var color = cols[parseInt(Math.random()*4)];

	$('#starsBox').prepend('<span style=" width: ' + size + 'px; height: ' + size + 'px; top: ' + Math.random()*100 + '%; left: ' + Math.random()*100 + '%; background: ' + color + '; box-shadow: 0 0 '+ Math.random()*10 +'px' + color + ';"></span>') ;
};

setTimeout(function(){ 
	$('#starsBox span').each(function(){  
 		$(this).css('top', Math.random()*100 + '%').css('left', Math.random()*100 + '%'); 
  });
}, 1);

setInterval(function(){ 
	$('#starsBox span').each(function(){  	
 		$(this).css('top', Math.random()*100 + '%').css('left', Math.random()*100 + '%'); 
  });
}, 100000);

<script src="js/jquery.min.js"></script>
<div id="starsBox">
<img src="http://oq77it33j.bkt.clouddn.com/cat.jpg" height="100%" width="100%"/></div>

<style>
* {
  box-sizing: border-box;
  padding: 0;
  margin: 0;
}

body {
  background: #22313f;
}

#starsBox {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.75);
  opacity: .85;
}
#starsBox span {
  display: inline-block;
  width: auto;
  position: absolute;
  border-radius: 100%;
  transition: 100s linear;
}

p {
  position: fixed;
  top: 50%;
  left: 0;
  right: 0;
  text-align: center;
  transform: translateY(-50%);
  font-size: 40px;
  font-weight: 900;
  color: white;
  text-shadow: 0 0 50px black;
  text-transform: uppercase;
  font-family: 'Roboto','Helvetica','Arial',sans-serif;
  letter-spacing: 5px;
}
p > span {
  display: block;
  font-size: 12px;
  color: #bdc3c7;
  margin-top: 30px;
  font-weight: 100;
  text-shadow: 0 0 50px black;
  letter-spacing: 3px;
}
p > span > a {
  font-weight: 700;
  text-decoration: none;
  color: #d64541;
  padding-bottom: 2px;
  border-bottom: 0px solid #d64541;
  transition: 0.5s;
}
p > span > a:hover {
  padding-bottom: 5px;
  border-bottom: 2px solid #d64541;
}
</style>