body {
  font-family: Arial, sans-serif;
  margin: 0;
  padding: 0;
}
header {
  background-color: #111;
  color: #fff;
  padding: 10px;
}
nav ul {
  list-style: none;
  display: flex;
  gap: 15px;
}
nav a {
  color: white;
  text-decoration: none;
}
footer {
  background-color: #f2f2f2;
  padding: 10px;
  text-align: center;
  margin-top: 50px;
}
main {
  padding: 20px;
}