body {
  font-family: sans-serif;
  margin: 0; padding: 0;
  line-height: 1.6;
}
header, footer {
  background: #004080;
  color: #fff;
  padding: 1rem;
}
nav a {
  color: #fff;
  margin-right: 1rem;
  text-decoration: none;
}
main {
  padding: 1rem;
}
h1, h2 {
  color: #004080;
}
ul, ol {
  margin-left: 1.5rem;
}
a {
  color: #0066cc;
}
a:hover {
  text-decoration: underline;
}