body {
  font-family: sans-serif;
  margin: 0;
  padding: 0;
  background: #f9f9f9;
  color: #333;
}

header, footer {
  background: #2d2d2d;
  color: white;
  padding: 15px 20px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

header a, footer a {
  color: #fff;
  text-decoration: none;
  margin: 0 10px;
  font-weight: bold;
}

main {
  max-width: 800px;
  margin: 40px auto;
  padding: 0 20px;
  background: #fff;
  border-radius: 8px;
}