preview.css

/*

  padding: 40px, 40px, 40px, 40px;

  margin-left: auto;
  margin-right: auto;
  margin-top: 0;
  margin-bottom: 0;
*/
body {
  width: 100%;
  background-color: #000;
  font-style: 14px;
  margin: 0 0 0 0;
  padding: 0 0 0 0;
}
div#main {
  width: 840px;
  min-width: 840px !important;
  max-width: 840px !important;
  margin: 20px auto 20px auto;
  padding: 0 20px 0 20px;
  background:
    transparent
    url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAACXBIWXMAAAsTAAALEwEAmpwYAAAABGdBTUEAALGOfPtRkwAAACBjSFJNAAB6JQAAgIMAAPn/AACA6QAAdTAAAOpgAAA6mAAAF2+SX8VGAAAArklEQVR42mJcu3btfyBgwAcYGRkZDA0Nf4FoAuA3QACxgAwjZCAUsBGjCCCAmBioDAACiOoGAgQQ1Q0ECCCqGwgQQFQ3ECCAqG4gQABR3UCAAGIhIrGCEzaRaZUBIIBYQDmAUKIFGXbhwgUGInIUG0AAEeVCmKHEuBIggKgehgABRHUDAQKI6gYCBBDVDQQIIKobCBBAVDcQIICobiBAALGAim1iFIISLTE5CiDAAM2ZItDrCdZCAAAAAElFTkSuQmCC)
    repeat;
}
/*
*/
img {
  width: 800px;
  min-width: 800px !important;
  max-width: 800px !important;
  border: 3px #f00 solid;
}
#main h1 {
  width: 800px;
  min-width: 800px !important;
  max-width: 800px !important;
  background-color: #000;
  color:  #fff;
  padding: 0.5em;
  margin: 10px 0;
}