.red, .blue, .green {
  width: 10em;
  height: 8em;
  display:inline-block;
}

.red {
  background-color: red;
}

.green {
  background-color: lime;
}

.blue {
  background-color: blue;
}

.links {
  position: fixed;
  bottom: 1em;
  left: 1em;
}