main {
  font-size: 24px;
  width: 400px;
}

body {
  overflow: auto;
}

#intro p {
  padding-bottom: 0.8em;
}

#background {
  z-index: -1;
  background: black;
  position: fixed;
  top: 0;
  bottom: 0;
  left: 0;
  right: 0;
}