<canvas id="Snow" style="position:fixed;top:0;left:0;width:100%;height:100%;z-index:99999;background:rgba(125,137,95,0.1);pointer-events:none;"></canvas>
<script>
    if(true){
        (function(){
            var requestAnimationFrame = window.requestAnimationFrame || window.mozRequestAnimationFrame || window.webkitRequestAnimationFrame || window.msRequestAnimationFrame ||
            function(callback){
                window.setTimeout(callback, 1000 / 60);
            };
            window.requestAnimationFrame = requestAnimationFrame;
        })();        
        (function(){
            var flakes = [],
                canvas = document.getElementById("Snow"),
                ctx = canvas.getContext("2d"),
                flakeCount = 200,
                mX = -100,
                mY = -100;            
            canvas.width = window.innerWidth;
            canvas.height = window.innerHeight;            
            function snow(){
                ctx.clearRect(0, 0, canvas.width, canvas.height);            
                for(var i = 0; i < flakeCount; i++){
                    var flake = flakes[i],
                        x = mX,
                        y = mY,
                        minDist = 150,
                        x2 = flake.x,
                        y2 = flake.y;            
                    var dist = Math.sqrt((x2 - x) * (x2 - x) + (y2 - y) * (y2 - y)),
                        dx = x2 - x,
                        dy = y2 - y;            
                    if(dist < minDist){
                        var force = minDist / (dist * dist),
                            xcomp = (x - x2) / dist,
                            ycomp = (y - y2) / dist,
                            deltaV = force / 2;            
                        flake.velX -= deltaV * xcomp;
                        flake.velY -= deltaV * ycomp;            
                    }else{
                        flake.velX *= .98;
                        if(flake.velY <= flake.speed){
                            flake.velY = flake.speed
                        }
                        flake.velX += Math.cos(flake.step += .05) * flake.stepSize;
                    }            
                    ctx.fillStyle = "rgba(255,255,255," + flake.opacity + ")";
                    flake.y += flake.velY;
                    flake.x += flake.velX;                        
                    if(flake.y >= canvas.height || flake.y <= 0){
                        reset(flake);
                    }            
                    if(flake.x >= canvas.width || flake.x <= 0){
                        reset(flake);
                    }            
                    ctx.beginPath();
                    ctx.arc(flake.x, flake.y, flake.size, 0, Math.PI * 2);
                    ctx.fill();
                }
                requestAnimationFrame(snow);
            };            
            function reset(flake){
                flake.x = Math.floor(Math.random() * canvas.width);
                flake.y = 0;
                flake.size = (Math.random() * 3) + 2;
                flake.speed = (Math.random() * 1) + 0.5;
                flake.velY = flake.speed;
                flake.velX = 0;
                flake.opacity = (Math.random() * 0.5) + 0.3;
            }            
            function init(){
                for (var i = 0; i < flakeCount; i++){
                    var x = Math.floor(Math.random() * canvas.width),
                        y = Math.floor(Math.random() * canvas.height),
                        size = (Math.random() * 3) + 2,
                        speed = (Math.random() * 1) + 0.5,
                        opacity = (Math.random() * 0.5) + 0.3;
            
                    flakes.push({
                        speed: speed,
                        velY: speed,
                        velX: 0,
                        x: x,
                        y: y,
                        size: size,
                        stepSize: (Math.random()) / 30 * 1,
                        step: 0,
                        angle: 180,
                        opacity: opacity
                    });
                }            
                snow();
            };            
            document.addEventListener("mousemove", function(e){
                mX = e.clientX,
                mY = e.clientY
            });
            window.addEventListener("resize", function(){
                canvas.width = window.innerWidth;
                canvas.height = window.innerHeight;
            });
            init();
        })();
    }
</script>