#box-1 {
  height:100vh;
  width:100%;
  background-image:url(i1.jpg);
  background-size:cover;
  display:table;
  background-attachment:fixed;
}

#box-2 {
  height:100vh;
  width:100%;
  background-image:url(i2.jpg);
  background-size:cover;
  display:table;
  background-attachment:fixed;
}

#box-3 {
  height:100vh;
  width:100%;
  background-image:url(i3.jpg);
  background-size:cover;
  display:table;
  background-attachment:fixed;
}

h1 {
  font-family:arial black;
  font-size:50px;
  color:white;
  margin:0px;
  text-align:center;
  display:table-cell;
  vertical-align:middle;
}