body {
  font-family: sans-serif;
  margin: 20px;
  background: #f7f7f7;
}
header {
  background: #004080;
  color: white;
  padding: 10px;
}
nav a {
  margin-right: 15px;
  color: white;
  text-decoration: none;
}
form {
  background: white;
  padding: 15px;
  border-radius: 5px;
}