body.generate-pdf {
  background-image: url(https://manula.r.sizr.io/large/user/18219/img/watermark.png);
  background-size: contain;
  background-position: center center;
  background-repeat: no-repeat;
}

body.media-screen #topic-body {
  background-image: url(https://manula.r.sizr.io/large/user/18219/img/watermark.png);
  background-size: contain;
  background-position: top center;
  background-repeat: no-repeat;
}