body {
  font-family: Arial, sans-serif;
  background-image: url("../img/fondo2.jpg");
  background-size: cover;
  background-repeat: no-repeat;
  padding: 20px;
}

.container {
  max-width: 400px;
  margin: auto;
  background: white;
  padding: 20px;
  border-radius: 8px;
  box-shadow: 0px 0px 10px rgba(0, 0, 0, 0.1);
}

input,
select,
button {
  display: block;
  width: 100%;
  margin-bottom: 15px;
  padding: 8px;
}

#resultado {
  font-weight: bold;
  margin-top: 10px;
}

#historial {
  margin-top: 10px;
}