/* Vertikaal centreren */
  table.container {top: 0; left: 0; width: 100%; height: 100%;
    position: fixed; display: table}
  p {display: table-cell; vertical-align: middle}

  /* Horizontaal centreren */
  img.displayed {display: block; margin: 1px auto}

  /* tekst centreren */
  p {text-align: center}