html, body {
  background-color: #000;
}

.workspace {
  width: 100%;
  height: 600px;
  border-color: #000;
  border-style: outset;
}

#canvas { /* match to CANVAS_ID in javascript */
  position:fixed; 
  top: 0px;
  left: 0px;
  margin: 0px !important;
  padding: 0px !important;
  pointer-events:none; /*make sure the canvas doesn't block the mouse from interacting with the page*/
  z-index: 100; /*Draws the canvas above everything with a z-index of 99 or lower.*/
}