html, body {
  height: 100%;
}

* {
  padding: 0;
  margin: 0;
}

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;
}