body {
  font-family: Arial, sans-serif;
  margin: 0;
  padding: 0;
  background: #f4f4f4;
}
.container {
  max-width: 600px;
  margin: auto;
  background: white;
  padding: 30px;
  margin-top: 40px;
  border-radius: 10px;
  box-shadow: 0 0 10px rgba(0,0,0,0.1);
}
h1 {
  text-align: center;
  color: #333;
}
form, .resultado {
  display: flex;
  flex-direction: column;
}
input, textarea {
  padding: 10px;
  font-size: 16px;
  margin-bottom: 20px;
  border: 1px solid #ccc;
  border-radius: 5px;
}
button {
  padding: 12px;
  font-size: 16px;
  margin-bottom: 10px;
  border: none;
  border-radius: 5px;
  cursor: pointer;
}
.copiar {
  background-color: #007bff;
  color: white;
}
.volver {
  background-color: #28a745;
  color: white;
}