html,
body {
  height: 100%;
}

body,
a {
  color: #dfdfdf;
}

body {
  background: #202020;
  font: 1em/1.5em sans-serif;
  margin: 0;
  padding: 0 1.5em;
}

body,
main {
  flex-direction: column;
  display: flex;
}

a:hover {
  color: orange;
}

main {
  flex: 1;
  justify-content: center;
  margin: auto;
  max-width: 40em;
}

footer {
  text-align: center;
}