body {
  font-family: Arial, sans-serif;
  margin: 0;
  padding: 0;
}
header {
  background-color: #004080;
  color: white;
  padding: 1em;
  text-align: center;
}
nav {
  background-color: #e0e0e0;
  padding: 0.5em;
  text-align: center;
}
nav a {
  margin: 0 1em;
  text-decoration: none;
  color: #004080;
}
main {
  padding: 1em;
}
form label {
  display: block;
  margin: 0.5em 0;
}