body {
  font-family: Arial, sans-serif;
  background: #111;
  color: #fff;
  margin: 0;
  padding: 0;
}

header, footer {
  background: #222;
  padding: 15px;
  text-align: center;
}

nav a {
  color: #00cfff;
  text-decoration: none;
  margin: 0 10px;
}

main {
  padding: 20px;
}

input, button {
  padding: 8px;
  margin: 5px 0;
}