*,*:before,*:after{margin:0;padding:0;}
body{width:800px;margin:0 auto;padding:25px;background:#000;color:#fff;font-family:Georgia;}
.cdiv {
  position: relative;
  width: 800px;
  height: 300px;
  border: 4px solid #08f;
}
/* OPTIONAL BACKGROUND VIA CSS */
/* div:before {
  content: "";
  position: absolute;
  z-index: -1;
  top: 0;
  left: 0;
  display: block;
  width: 100%;
  height: 2px;
  box-shadow: 0 0 1px 0 #024,
              0 25px 1px 0 #024,
              0 50px 1px 0 #024,
              0 75px 1px 0 #024,
              0 100px 1px 0 #024,
              0 125px 1px 0 #024,
              0 150px 1px 0 #024,
              0 175px 1px 0 #024,
              0 200px 1px 0 #024,
              0 225px 1px 0 #024,
              0 250px 1px 0 #024,
              0 275px 1px 0 #024,
              0 300px 1px 0 #024;
} */
canvas {
  position: absolute;
  top: 0;
  left: 0;
}