body {
  font-family: Arial, sans-serif;
  margin: 0; padding: 0;
  background-color: #f9f9f9;
}
header {
  background-color: #003366;
  color: #fff;
  padding: 1rem;
  text-align: center;
}
nav a {
  margin: 0 1rem;
  color: #fff;
  text-decoration: none;
}
main {
  padding: 2rem;
}
form {
  background: #fff;
  padding: 2rem;
  border-radius: 8px;
  box-shadow: 0 0 10px rgba(0,0,0,0.1);
  max-width: 600px;
  margin: auto;
}
input, select, button {
  display: block;
  width: 100%;
  margin-bottom: 1rem;
  padding: 0.5rem;
}
button {
  background-color: #003366;
  color: white;
  border: none;
  cursor: pointer;
}