Example

by Kirubel Girma

HTML

<div class="fpgs">
  <div class="itms">STUFF GOES HERE!</div>
</div>

<div class="therestofthepage">
  
</div>

CSS

body {
  height: 100%;
  width: 100%;
  display: block;
  position: absolute;
  background: white;
}

.fpgs {
    height: 100%;
  width: 100%;
    background: white;
}
.itms {
  background: yellow;
  width: 10em;
  height: 1em;
  padding: 1em;
  margin: auto;
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
}

.therestofthepage {
  width: 100%;
  height: 100em;
  background: grey;
}