html,
body {
  margin: 0;
  padding: 0;
  height: 100%;
  width: 100%;
  background-color: rgb(220, 220, 220);
}

canvas {
  display: block;
}

body {
  display: flex;
  justify-content: center;
  align-items: center;
}

.grabbable {
  cursor: move;
  cursor: grab;
  cursor: -moz-grab;
  cursor: -webkit-grab;
}

.grabbable:active {
  cursor: grabbing;
  cursor: -moz-grabbing;
  cursor: -webkit-grabbing;
}