body {
  font-family: 'Segoe UI', Arial, sans-serif;
  background-color: #f5f5f5;
  color: #222;
  margin: 0;
  padding: 0;
}
header {
  background-color: #003366;
  color: white;
  padding: 10px 20px;
  text-align: center;
}
form {
  background: white;
  padding: 20px;
  margin: 30px auto;
  max-width: 500px;
  border-radius: 8px;
  box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}
button {
  background-color: #003366;
  color: white;
  padding: 8px 15px;
  border: none;
  border-radius: 4px;
}