window.onload = function() {
  // The different colour schemes available.
  var rainbows = [
    ['8BB300', '624414', 'B1FFDE', 'BFB183', '56E8DD'],
    ['468966', 'FFF0A5', 'FFB03B', 'B64926', '8E2800'],
    ['B4AF91', '787746', '40411E', '32331D', 'C03000'],
    ['85DB18', 'CDE855', 'F5F6D4', 'A7C520', '493F0B'],
    ['FF0000', 'FF950B', '2FA88C', 'DEEB00', '4B2C04']
  ];
  var holder = document.getElementById('colours');
  var random = Math.floor(Math.random() * rainbows.length)
  for (var i = 0; i < rainbows[random].length; i++) {
    var div = document.createElement('div');
    div.setAttribute('style', 'background-color: #' + rainbows[random][i] + ';');
    holder.appendChild(div);
  }
}