body {
  font-family: Arial, sans-serif;
  background-color: #e9f0f5;
  padding: 20px;
}

h1 {
  color: #2c3e50;
}

form {
  margin-top: 20px;
}

input, button {
  padding: 8px;
  margin-top: 10px;
}

#mensagem {
  margin-top: 20px;
  font-weight: bold;
  color: green;
}