body {
  font-family: Arial, sans-serif;
  background: #111;
  color: #eee;
  margin: 0;
}
header, footer {
  background: #222;
  padding: 1rem;
  text-align: center;
}
main {
  padding: 2rem;
}
a { color: #0af; text-decoration: none; }
a:hover { text-decoration: underline; }