body {
  font-family: Arial;
  background: #f4f4f4;
}

.container {
  background: white;
  padding: 30px;
  margin: 50px auto;
  max-width: 600px;
  border-radius: 10px;
}

h1 {
  color: #2c3e50;
}

button {
  padding: 10px 15px;
  background: #007bff;
  border: none;
  color: white;
  border-radius: 5px;
  cursor: pointer;
}

#result {
  margin-top: 20px;
}