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

header {
  background-color: #222;
  color: #fff;
  padding: 2em;
  text-align: center;
}

nav {
  background: #444;
  padding: 1em;
  text-align: center;
}

.centered-image {
  display: block;
  margin-left: auto;
  margin-right: auto;
  width: 50%;
}

nav a {
  color: #fff;
  margin: 0 15px;
  text-decoration: none;
}


section {
  padding: 2em;
  max-width: 800px;
  margin: auto;
}

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