html, body {
  height: 100%;
}

body {

  /* leave it to hide the scrollbars */
  overflow: hidden;
  padding: 0;
  margin: 0;
  display: flex;

  / This centers our sketch horizontally. */
  justify-content: center;

  / This centers our sketch vertically. */
  align-items: center;
}
canvas {
padding: 0;
margin: auto;
display: block;
position: absolute;
top: 0;
bottom: 0;
left: 0;
right: 0;

}