body {
  font-family: Arial, sans-serif;
  margin: 0;
  padding: 0;
  line-height: 1.6;
}

header {
  background: black;
  color: yellow;
  padding: 1rem;
  text-align: center;
}

nav a {
  color: yellow;
  margin: 0 10px;
  text-decoration: none;
  font-weight: bold;
}

section {
  padding: 2rem;
}

footer {
  background: #222;
  color: white;
  text-align: center;
  padding: 1rem;
}