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              <canvas id="canvas"></canvas>
<header>
  <h1>Welcome to Griffith Observatory</h1>
  <h2>Where Cosmos Matters<sup>tm</sup></h2>
  <p>
    <a href="#">See all events</a>
    <a href="#">Visit our Facebook</a>
  </p>
  <p>"<a href="https://www.flickr.com/photos/flyshades/314496975/">Griffith Observatory</a>" by <a href="https://www.flickr.com/photos/flyshades/">flyshades</a> / <a href="https://creativecommons.org/licenses/by-nc-nd/2.0/">CC BY-NC-ND</a></p>
</header>
            
          
!
            
              body {
  font-family: sans-serif;
  background: url('https://leibrug.pl/img/posts/enhance-your-media-with-canvas-over-technique/canvas-over-observatory.jpg') no-repeat right top;
  background-size: cover;
  height: 100vh;
}
canvas, header {
  position: absolute;
}
header {
  bottom: 0;
  right: 0;
  padding: 20px;
  background: rgba(100, 140, 180, .5);
  h1 { font-size: 36px; }
  h2 {
    font-size: 24px;
    sup {
      vertical-align: super;
      font-size: 12px;
    }
    ~ p {
      margin-top: 15px;
      a[href='#'] {
        text-decoration: none;
        display: inline-block;
        margin-right: 5px;
        padding: 10px 15px;
        background: rgba(255, 255, 255, .25);
        border-radius: 15px;
      }
    }
  }
  &, a { color: #eee; }
}
            
          
!
            
              // Cache page dimensions
var bodyWidth = $('body').width(),
    bodyHeight = $('body').height();

// Stretch canvas
$('#canvas').attr({
  width: bodyWidth,
  height: bodyHeight
});

// Get canvas context
var ctx = $('#canvas')[0].getContext('2d');

// Random grey generator
function getRandomGrey() {
  var shade = Math.floor(Math.random() * 101) + 70,
      grey = '#' + shade.toString(16).repeat(3);
  
  return grey;
}

// Place star on the canvas
function putStar() {
  var starX = Math.random() * bodyWidth,
      starY = Math.random() * bodyHeight / 3,
      starColor = getRandomGrey();
  
  ctx.fillStyle = starColor;
  ctx.fillRect(starX, starY, 2, 2);
}

// Draw stars in a loop
var starCount = 0;
function drawStar() {
  putStar();
  starCount++ >= 100 || setTimeout(drawStar, 10);
}
drawStar();
            
          
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999px
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