body {
  font-family: Arial, sans-serif;
  background-color: #111;
  color: white;
  margin: 0;
  padding: 0;
}
header {
  background: #000;
  text-align: center;
  padding: 20px;
}
.logo {
  width: 150px;
}
nav a {
  color: white;
  margin: 0 10px;
  text-decoration: none;
}
section {
  padding: 20px;
}