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

header {
  background: #2c3e50;
  padding: 15px;
}

nav a {
  color: #fff;
  margin-right: 15px;
  text-decoration: none;
}

main {
  padding: 40px;
}

footer {
  background: #f4f4f4;
  padding: 20px;
  text-align: center;
}