.background {
  display: block;
  position: fixed;
}

.background_patch {
  text-align: center;
}

#deemo_bg {
  background-image: url("../img/bg.gif");

  background-repeat: repeat-y;
  background-position: center;
  background-size: 1920px 3227px;

  width: 100%;
  height: 3000px;

  z-index: -9999;
}