<script type="text/javascript">
particlesJS("particles-js", {
  "particles": {
    "number": {
      "value": 400,
      "density": {
        "enable": true,
        "value_area": 800
      }
    },
    "color": {
      "value": "#b7bcbb"
    },
    "shape": {
      "type": "image",
      "stroke": {
        "width": 3,
        "color": "#b7bcbb"
      },
      "polygon": {
        "nb_sides": 5
      },
      "image": {
        "src": "https://forumstatic.ru/files/0019/c5/48/59086.png",
        "width": 3,
        "height": 3
      }
    },
    "opacity": {
      "value": 0.7,
      "random": false,
      "anim": {
        "enable": false,
        "speed": 1,
        "opacity_min": 0.1,
        "sync": false
      }
    },
    "size": {
      "value": 2,
      "random": true,
      "anim": {
        "enable": false,
        "speed": 20,
        "size_min": 0.1,
        "sync": false
      }
    },
    "line_linked": {
      "enable": false,
      "distance": 50,
      "color": "#ffffff",
      "opacity": 0.6,
      "width": 1
    },
    "move": {
      "enable": true,
      "speed": 5,
      "direction": "bottom",
      "random": true,
      "straight": false,
      "out_mode": "out",
      "bounce": false,
      "attract": {
        "enable": true,
        "rotateX": 300,
        "rotateY": 1200
      }
    }
  },
  "interactivity": {
    "detect_on": "canvas",
    "events": {
      "onhover": {
        "enable": true,
        "mode":  "bubble"
      },
      "onclick": {
        "enable": true,
        "mode": "repulse"
      },
      "resize": true
    },
    "modes": {
      "grab": {
        "distance": 150,
        "line_linked": {
          "opacity": 1
        }
      },
      "bubble": {
        "distance": 200,
        "size": 40,
        "duration": 2,
        "opacity": 8,
        "speed": 3
      },
      "repulse": {
        "distance": 200,
        "duration": 0.2
      },
      "push": {
        "particles_nb": 4
      },
      "remove": {
        "particles_nb": 2
      }
    }
  },
  "retina_detect": true
});
</script>

#particles-js{
 display: block;
position: fixed;
    width: 450px;
    height: 100%;
  top: 0;
  left: 0;
  bottom: 0;
  right: 0;
  z-index: -1;
  overflow: hidden;
filter: blur(4px) opacity(2);
}

@media only screen and (max-device-width: 540px) {
    .snow {
      display: none;
    }
}

.snow {
display: block;
position: fixed;
    width: 450px;
    height: 100%;
    position: fixed;
    top: 0px;
    left: 0px;
z-index: -1;
}

canvas {
 display: block;
position: fixed;
    width: 450px;
    height: 100%;
  top: 0;
  left: 0;
  bottom: 0;
  right: 0;
  z-index: -1;
  overflow: hidden;
filter: blur(4px) opacity(2);
}

<!--Снег -->
<canvas id="canvas"></canvas>
   <script type="text/javascript">
(function() {
    var requestAnimationFrame = window.requestAnimationFrame || window.mozRequestAnimationFrame || window.webkitRequestAnimationFrame || window.msRequestAnimationFrame ||
    function(callback) {
        window.setTimeout(callback, 1000 / 60);
    };
    window.requestAnimationFrame = requestAnimationFrame;
})();


var flakes = [],
    canvas = document.getElementById("canvas"),
    ctx = canvas.getContext("2d"),
    flakeCount = 400,
    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,
            step: 0,
            opacity: opacity
        });
    }

    snow();
};

canvas.addEventListener("mousemove", function(e) {
    mX = e.clientX,
    mY = e.clientY
});

window.addEventListener("resize",function(){
    canvas.width = window.innerWidth;
    canvas.height = window.innerHeight;
})

init();
</script>