body {
  display: flex;
  flex-direction: column;

  min-height: 100%;
  width: 100%;
  align-items: center;
}

body > #content {
  flex-grow: 1;
}

body > #footer {
  display: flex;
  flex-grow: 0;

  width: 100%;
  margin-top: 20px;
  padding: 10px;

  background-color: gray;
  color: white;
}

body > #footer a {
  text-decoration: none;
}

body > #footer a:visited {
  color: white;
}