html,
body {
  height: 100%;
  margin: 0px;/*overflow: hidden;*/

}

body { /*overflow: hidden;*/
}

.wrapper { height: 100%; }

.halaman {
  width: 100%;
  height: 100%;
}

.img1 {
  background: url('http://placehold.it/1280x800&text=Scroll%20Down') no-repeat center center;
  background-size: cover;
}

.img2 {
  background: url('http://placehold.it/1280x800&text=or Up') no-repeat center center;
  background-size: cover;
}

.img3 {
  background: url('http://placehold.it/1280x800&text=Lorem%20Ipsum') no-repeat center center;
  background-size: cover;
}

.img4 {
  background: url('http://placehold.it/1280x800/222222/eeeeee&text=jQuery SekerolPoin Demo') no-repeat center center;
  background-size: cover;
}

.img5 {
  background: url('http://placehold.it/1280x800&text=Thank%20You') no-repeat center center;
  background-size: cover;
}