body {
  margin: 8em auto 2em;
}

#logo {
  width: 100%;
  margin: 1em 0 3em;
  color: white;
  height: 5em;
  display: block;
  position: absolute;
  top: 0;
  left: 50%;
  transform: translate(-50%, 0);
  transform-origin: 0 0;
}