<canvas id="canvas"></canvas>
body {
  background: #B7004E;
  height: 100%;
  width: 100%;
  margin: 0;
  padding: 0;
}
var HeartsBackground = {
  heartHeight: 60,
  heartWidth: 64,
  hearts: [],
  heartImage: 'http://i58.tinypic.com/ntnw5.png',
  maxHearts: 8,
  minScale: 0.4,
  draw: function() {
    this.setCanvasSize();
    this.ctx.clearRect(0, 0, this.w, this.h);
    for (var i = 0; i < this.hearts.length; i++) {
      var heart = this.hearts[i];
      heart.image = new Image();
      heart.image.style.height = heart.height;
      heart.image.src = this.heartImage;
      this.ctx.globalAlpha = heart.opacity;
      this.ctx.drawImage (heart.image, heart.x, heart.y, heart.width, heart.height);
    }
    this.move();
  },
  move: function() {
    for(var b = 0; b < this.hearts.length; b++) {
      var heart = this.hearts[b];
      heart.y += heart.ys;
      if(heart.y > this.h) {
        heart.x = Math.random() * this.w;
        heart.y = -1 * this.heartHeight;
      }
    }
  },
  setCanvasSize: function() {
    this.canvas.width = window.innerWidth;
    this.canvas.height = window.innerHeight;
    this.w = this.canvas.width;
    this.h = this.canvas.height;
  },
  initialize: function() {
    this.canvas = $('#canvas')[0];

    if(!this.canvas.getContext)
      return;

    this.setCanvasSize();
    this.ctx = this.canvas.getContext('2d');

    for(var a = 0; a < this.maxHearts; a++) {
      var scale = (Math.random() * (1 - this.minScale)) + this.minScale;
      this.hearts.push({
        x: Math.random() * this.w,
        y: Math.random() * this.h,
        ys: Math.random() + 1,
        height: scale * this.heartHeight,
        width: scale * this.heartWidth,
        opacity: scale
      });
    }

    setInterval($.proxy(this.draw, this), 30);
  }
};

$(document).ready(function(){
  HeartsBackground.initialize();
});

External CSS

This Pen doesn't use any external CSS resources.

External JavaScript

  1. https://cdnjs.cloudflare.com/ajax/libs/jquery/2.1.3/jquery.min.js