body {
  font-family: sans-serif;
  background: #f5f5f5;
  padding: 20px;
}
.container {
  max-width: 400px;
  margin: auto;
  background: white;
  padding: 20px;
  border-radius: 8px;
}
form label {
  display: block;
  margin: 10px 0;
}
button {
  background-color: #0d6efd;
  color: white;
  padding: 10px;
  border: none;
  border-radius: 4px;
}
#result {
  margin-top: 20px;
  background: #eaf4ff;
  padding: 10px;
  border-radius: 5px;
}