html, body {
  margin: 0;
  padding: 0;
  
}

canvas {
  display: block;
  position: absolute;
  z-index: -1;
}

table {
  background: darkgrey;
  /* round the corners */
  border-radius: 10px;
  /* add a drop shadow */
  box-shadow: 0 0 20px rgba(0, 0, 0, 0.5);
  user-select: none;
}