SOURCE

const canvas = document.getElementById("canvas");
    const ctx = canvas.getContext("2d");
    let h = window.innerHeight, w = window.innerWidth;
    //w = w  > 540 ? 540 : w;
    canvas.width = w;
    canvas.height = h;
    canvas.style.width = w + "px";
    canvas.style.height = h + "px";

    var Fps = {
        nc : 0,
        nt : +new Date,
        fps : []
    }

    let Bg =  {
        particles : [],
        init : ()=>{
            var n = 200;
            while(n--){
                Bg.particles.push(Bg.setParticle());
            }
            Bg.run();
        },
        setParticle : ()=>{
            let x = rand(0,w),y = rand(0,h),r = rand(100,255,1),g = rand(100,255,1),b = rand(100,255,1),a = rand(0,1),vx = rand(0,1,0,1)/3,vy = rand(0,1,0,1)/3;
            return {
                x : x,
                y : y,
                r : r,
                g : g,
                b : b,
                a : a,
                vx: vx,
                vy: vy,
            }
        },
        draw : ()=>{
            ctx.clearRect(0,0,w,h);
            var len = Bg.particles.length;
            for(var x =0;x<len+1;x++){
                let p = Bg.particles[x];
                for(var xx = x+1;xx<len;xx++){
                    let pp = Bg.particles[xx];
                    //console.log(distance(p.x,p.y,pp.x,pp.y))
                  var n = 70;
                  if(w<1200) n=40; 
                  if(w<600) n=20;
                    if(distance(p.x,p.y,pp.x,pp.y)>n) continue;
                    ctx.beginPath();
                    let style = ctx.createLinearGradient(p.x,p.y,pp.x,pp.y);
                    style.addColorStop(0,"rgba("+p.r+","+p.g+","+p.b+",.3)");
                    style.addColorStop(1,"rgba("+pp.r+","+pp.g+","+pp.b+",.3)");
                    ctx.strokeStyle = style;
                    ctx.moveTo(p.x,p.y);
                    ctx.lineTo(pp.x,pp.y);
                    ctx.stroke();
                    ctx.closePath();
                }
            }
            for(let x in Bg.particles){
                let p = Bg.particles[x];
                ctx.beginPath();
                //ctx.fillStyle = "#000";
                //ctx.arc(p.x,p.y,1,0,Math.PI*2);
                //ctx.fill();
                ctx.fillStyle = "rgba("+p.r+","+p.g+","+p.b+","+p.a+")";
                ctx.arc(p.x,p.y,1,0,Math.PI*2);
                ctx.fill();
                ctx.closePath();
            }
        },
        run : ()=>{
            Bg.draw();
            for(let x in Bg.particles){
                let p = Bg.particles[x];
                p.x+=p.vx;
                p.y+=p.vy;
                p.vx = (p.x>=w || p.x<=0) ? -p.vx :p.vx; 
                p.vy = (p.y>=h || p.y<=0) ? -p.vy :p.vy; 
                p.vx = Math.abs(p.vx) > 0.33 ? p.vx/1.01 : p.vx;
                p.vy = Math.abs(p.vy) > 0.33 ? p.vy/1.01 : p.vy;
                p.r++;
                p.g+=2;
                p.b+=3;
                p.r = p.r>255 ? 100 : p.r;
                p.g = p.g>255 ? 100 : p.g;
                p.b = p.b>255 ? 100 : p.b;
            }
            if((+new Date) - Fps.nt>1000){
                //console.log(Fps.nc)
                Fps.nc = 0;
                Fps.nt = +new Date;
            }
            Fps.nc++;
            requestAnimationFrame(()=>{Bg.run()})
        },
        tap :(x,y)=>{
            for(let i in Bg.particles){
                let v = Bg.particles[i];
                if(distance(v.x,v.y,x,y)>100) continue;
                if((v.x-x) * v.vx < 0) v.vx = -v.vx;
                if((v.y-y) * v.vy < 0) v.vy = -v.vy;
                v.vx = Math.abs(v.vx)>1 ? v.vx : v.vx*10;
                v.vy = Math.abs(v.vy)>1 ? v.vy : v.vy*10;
            }
        }
    };
    

    Bg.init();


    function rand(a,b,i,z){
        let x = Math.random()*(b-a)+a;
        x =  i ? parseInt(x) : x;
        return  z ? Math.random()>0.5 ? -x : x : x;
    }
    function distance(x1,y1,x2,y2){
        return Math.sqrt((x1-x2)*(x1-x2)+(y1-y2)*(y1-y2));
    }
    canvas.onclick = function(e){
        Bg.tap(e.offsetX,e.offsetY);
    }

    <canvas id="canvas"></canvas>

body{;margin:0 auto;}
    #canvas{background:#000;margin:0;display:block;}