/* Set the page to fill the window */
html, body {
  margin: 0;
  padding: 0;
  background-color: #9542f4;
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* Display the canvas as a block to avoid offsets */
canvas {
  width: 500px;
  height: 500px;
}