body {
  font-family: Arial, sans-serif;
  background: #f8f8f8;
  padding: 20px;
}
.container {
  background: #fff;
  padding: 30px;
  border-radius: 8px;
  max-width: 600px;
  margin: auto;
  box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}
h1 {
  margin-bottom: 20px;
  text-align: center;
}
form label {
  display: block;
  margin-top: 10px;
}
form input, form select {
  width: 100%;
  padding: 8px;
  margin-top: 4px;
}
button {
  margin-top: 20px;
  padding: 10px;
  width: 100%;
  background-color: #28a745;
  color: white;
  font-size: 16px;
  border: none;
  border-radius: 5px;
  cursor: pointer;
}
#resultado {
  margin-top: 30px;
  font-weight: bold;
}