body {
  font-family: Arial, sans-serif;
  max-width: 600px;
  margin: 0 auto;
  padding: 2rem;
  background-color: #f7f7f7;
  color: #333;
}

header {
  text-align: center;
  margin-bottom: 2rem;
}

input {
  width: 100%;
  padding: 0.5rem;
  margin: 1rem 0;
  font-size: 1rem;
}

button {
  padding: 0.5rem 1rem;
  font-size: 1rem;
  cursor: pointer;
}

#result {
  margin-top: 1.5rem;
  padding: 1rem;
  background: #fff;
  border: 1px solid #ccc;
  border-radius: 8px;
}