body {
  margin:40px auto;
  max-width:1280px;
  line-height:1.6;
  font-size:110%;
  padding:0 15px;
  padding-bottom: 1em;
  background-color: black;
  color: white;
}
h1,h2,h3 {
  line-height:1.2
}

.footer {
  position: fixed;
  left: 0;
  bottom: 0;
  width: 100%;
  background-color: black;
  color: white;
  text-align: center;
}