<div class="snow-wrapper">
        <canvas class="snow" id="snow"></canvas>  
</div>
<style>
body {
    margin: 0;
    padding: 0;
}
.snow-wrapper {
  background-color: #111;
  height: 50vh;
  width: 100vw;
}
.snow {
  height: 100%;
  position: absolute;
  width: 100%;
}
</style>
<script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.4/lodash.min.js"></script>
<script>
const Snow = (canvas, count, options) => {
  const ctx = canvas.getContext("2d");
  const snowflakes = [];
  const add = (item) => snowflakes.push(item(canvas));
  const update = () => _.forEach(snowflakes, (el) => el.update());
  const resize = () => {
    ctx.canvas.width = canvas.offsetWidth;
    ctx.canvas.height = canvas.offsetHeight;
    _.forEach(snowflakes, (el) => el.resized());
  };
  const draw = () => {
    ctx.clearRect(0, 0, canvas.offsetWidth, canvas.offsetHeight);
    _.forEach(snowflakes, (el) => el.draw());
  };
  const events = () => {
    window.addEventListener("resize", resize);
  };
  const loop = () => {
    draw();
    update();
    animFrame(loop);
  };
  const init = () => {
    _.times(count, () => add((canvas) => SnowItem(canvas, null, options)));
    events();
    loop();
  };
  init(count);
  resize();
  return { add, resize };
};
const defaultOptions = {
  color: "orange",
  radius: [0.5, 3.0],
  speed: [1, 3],
  wind: [-0.5, 3.0]
};
const SnowItem = (canvas, drawFn = null, opts) => {
  const options = { ...defaultOptions, ...opts };
  const { radius, speed, wind, color } = options;
  const params = {
    color,
    x: _.random(0, canvas.offsetWidth),
    y: _.random(-canvas.offsetHeight, 0),
    radius: _.random(...radius),
    speed: _.random(...speed),
    wind: _.random(...wind),
    isResized: false
  };
  const ctx = canvas.getContext("2d");
  const updateData = () => {
    params.x = _.random(0, canvas.offsetWidth);
    params.y = _.random(-canvas.offsetHeight, 0);
  };
  const resized = () => (params.isResized = true);
  const drawDefault = () => {
    ctx.beginPath();
    ctx.arc(params.x, params.y, params.radius, 0, 2 * Math.PI);
    ctx.fillStyle = params.color;
    ctx.fill();
    ctx.closePath();
  };
  const draw = drawFn ? () => drawFn(ctx, params) : drawDefault;
  const translate = () => {
    params.y += params.speed;
    params.x += params.wind;
  };
  const onDown = () => {
    if (params.y < canvas.offsetHeight) return;
    if (params.isResized) {
      updateData();
      params.isResized = false;
    } else {
      params.y = 0;
      params.x = _.random(0, canvas.offsetWidth);
    }
  };
  const update = () => {
    translate();
    onDown();
  };
  return {
    update,
    resized,
    draw
  };
};
const el = document.querySelector(".container");
const wrapper = document.querySelector("body");
const canvas = document.getElementById("snow");
const animFrame =
  window.requestAnimationFrame ||
  window.mozRequestAnimationFrame ||
  window.webkitRequestAnimationFrame ||
  window.msRequestAnimationFrame;
Snow(canvas, 150, { color: "white" });
</script>