body {
  background-color: #000;
  color: #FFF;
}

#content {
  width: 100%;
  height: 100%;
  display: table-cell;
  vertical-align: middle
}

#content div {
  margin-left: auto;
  margin-right: auto;
  width: 33%;
  background-color: #F00;
  padding: 15px;
  border: 1px solid #FFF;
  border-radius: 5px;
  font-family: Verdana;
  font-size: 10px;
}