JSFiddle - React, Tailwind, and code Playground

CSS

body {
	background: #000;
}
.obj  {
	border-radius: 50%;
	opacity: 1;
	box-shadow: 0px 0px 15px #fff;
	border-radius: 50%;
	position: absolute;
	background: #fff;
}

JavaScript

$(window).load(function() {
	for(i=1; i<500; i++) addPlanet();
});
	
function mooveItem(item, speed, pos, direction) {

	if(isNaN(item.ldir)) item.ldir	= pos.min;
	if(isNaN(item.tdir)) item.tdir	= pos.min;

	if(direction == "h") item.ldir = item.ldir == pos.max ? pos.min : pos.max;
	if(direction == "v") item.tdir = item.tdir == pos.max ? pos.min : pos.max;

	var animation = direction == "v" ? { top : item.tdir } : { left : item.ldir };

	item.animate(animation, {
	duration	: speed,
	complete	: function() { mooveItem(item, speed, pos, direction); },
	queue	: false
	});
}

function addPlanet() {
	
	var bodyw	= $("body").innerWidth();
	var bodyh	= $(window).height();
    var vert	= Math.floor(Math.random() * bodyh);
	
	var size	= Math.floor(Math.random() * 50);
	var speed	= size * 1000;
	var obj	= $("<div>");
	
	obj
	.addClass("obj")	
	.css("left", bodyw / 2)
	.css("top", bodyh / 2)
	.css("width", size)
	.css("height", size);

	mooveItem(obj, speed, { min: size * 10, max: bodyw - size * 10 }, "h");
	mooveItem(obj, speed, { min: vert, max: vert }, "v");
	
	$("body").append(obj);
}