body {
  font-family: sans-serif;
  background: #f6f9fc;
  padding: 20px;
}
.container {
  max-width: 400px;
  margin: auto;
  background: white;
  padding: 20px;
  border-radius: 8px;
}
.result {
  margin-top: 20px;
  font-weight: bold;
}