body {
  font-family: Arial, sans-serif;
  background-color: #f2f2f2;
  padding: 20px;
}

.contenedor {
  background-color: white;
  max-width: 400px;
  margin: auto;
  padding: 20px;
  border-radius: 8px;
  box-shadow: 0 0 5px gray;
}

h1 {
  text-align: center;
  font-size: 20px;
}

label {
  display: block;
  margin-top: 10px;
}

input {
  width: 100%;
  padding: 6px;
  margin-top: 4px;
  box-sizing: border-box;
}

button {
  margin-top: 15px;
  width: 100%;
  padding: 8px;
  background-color: #673AB7;
  color: white;
  border: none;
  border-radius: 4px;
  cursor: pointer;
}

#resultado {
  margin-top: 15px;
  font-weight: bold;
  text-align: center;
  padding: 10px;
  border-radius: 4px;
}

.aprobado {
  background-color: #c8e6c9;
  color: #256029;
}

.reprobado {
  background-color: #ffcdd2;
  color: #b71c1c;
}

.error {
  color: red;
}