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HTML

              
                   <svg width="100%" viewBox="0 0 1000 1000" id="tile">
<rect id="background" width="1000" height="1000" style="fill:rgba(5,0,20,1)" z=0 />
<g id="starGroup">
<g class="starGroup" id="mStarGroup"></g>
</g>
    </svg>

              
            
!

CSS

              
                body{
  margin:0;
}
              
            
!

JS

              
                let x = 1000;
let y = parseInt(1000 * window.innerHeight / window.innerWidth);
let tile = document.getElementById('tile')
tile.setAttribute('viewBox', `0 0 ${x} ${y}`);
tile.querySelector('rect#background').setAttribute('height', y)
tile.querySelector('rect#background').setAttribute('width', x)

//These timelines hold the timelines for each point, allowing them to be grouped together
//For travelling horizontally
let timelineX = new TimelineMax({
            onComplete: function() {
                this.restart()
            },
            onReverseComplete: function() {
                this.reverse(0.1);
            },
            repeat: -1,
        });
//For travelling vertically
let timelineY = new TimelineMax({
            onComplete: function() {
                this.restart()
            },
            onReverseComplete: function() {
                this.restart(0.1);
            },
            repeat: -1,
        });

//To control the speed/direction of the travelling
//Accellerate Y to demonstrate point
        TweenLite.to(timelineY,5,{timeScale:-100})
//X is not required for this, but has similar issue



//The things that get drawn & tweened
let star = (sX, sY, z = Math.random())=> {
                //Draw aspect
                let star = document.createElementNS("http://www.w3.org/2000/svg", 'rect')
                star.setAttribute('width', 2);
                star.setAttribute('height', 2);
                star.setAttribute('x', sX);
                star.setAttribute('y', sY);
                star.setAttribute('rx', 1);
                star.setAttribute('ry', 1);
                star.style = `fill:rgba(${255},${230}, ${235},${Math.random()})`;
                tile.appendChild(star);
              //Tween/Timeline aspect
              //I wanted these to start in the [sX,sY] position then go to one side, and then return from the other to the original position but it didn't quite work out
                let xPath = new TimelineMax();
                xPath.add(TweenLite.fromTo(star, (x) * z / 5, {
                    x: x  - sX,
                    ease: Linear.easeNone,
                }, {
                    x: 0 - (sX + 1),
                    ease: Linear.easeNone,
                }))
                xPath.repeat(-1);

                let yPath = new TimelineMax();
                yPath.add(TweenLite.fromTo(star, (y) * z / 5, {
                    y: y  - sY,
                    ease: Linear.easeNone,
                }, {
                    y: 0 - (sY + 1),
                    ease: Linear.easeNone,
                }))
                yPath.repeat(-1);
				//In the end this seemed to work to get the stars to start in the random places
                timelineX.add(xPath, (0 - sX) * 5); 
                timelineY.add(yPath, (0 - sY) * 5);


            
        }
          //This populates with the stars
            for (var cX = 0; cX < x; cX++) {
                for (var cY = 0; cY < y; cY++) {
                    if (Math.random() <= (0.0008)) {
                        star(cX, cY)
                    };
                }
            }
        

              
            
!
999px
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