body {
  font-family: Arial, sans-serif;
  margin: 20px;
  background: #f5f5f5;
}

header {
  background: #0b5394;
  color: white;
  padding: 15px;
  text-align: center;
  border-radius: 8px;
}

button {
  background-color: #0b5394;
  color: white;
  border: none;
  padding: 10px 20px;
  border-radius: 5px;
  cursor: pointer;
}

button:hover {
  background-color: #073763;
}