body {
  font-family: sans-serif;
  line-height: 1.6;
  margin: 0;
  padding: 0;
  background: #f9f9f9;
}
header, footer {
  background: #003366;
  color: white;
  padding: 1em;
  text-align: center;
}
nav a {
  margin: 0 1em;
  color: white;
  text-decoration: none;
}
main {
  padding: 2em;
}
section {
  margin-bottom: 2em;
}
a {
  color: #0066cc;
}