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

}
canvas {
  display: block;
  
    /* This centers our sketch horizontally. */
  justify-content: center;

  /* This centers our sketch vertically. */
  align-items: center;
  
  box-shadow: 0 10px 20px rgba(0,0,0,0.19), 0 6px 6px rgba(0,0,0,0.23);
  text-align:center;
}