html {
    background: black;
    height: 100%;
    overflow: hidden;
}

body {
    margin: 0;
    padding: 0;
    height: 100%;
}

canvas {
	position:absolute;
      left:0;
      top:0;
      z-index:-1;
	width: 100%;
}

div {
    position:absolute;
    z-index:0;
    left:12px;
    top:10px;
}
.shadowbox {
  width: 50%;
  border: 1px solid #333;
  position: fixed;
  top: 50%;
  left: 25%;
  box-shadow: 8px 8px 5px #444;
  padding: 8px 12px;
  background-image: linear-gradient(180deg, #fff, #ddd 40%, #ccc);
}