body {
  font-family: Arial, Helvetica, sans-serif;
  text-align: center;
  margin-top: 2rem;
}
#swatch {
  width: 200px;
  height: 200px;
  margin: 1rem auto;
  border: 2px solid #333;
}
#code {
  font-size: 1.2rem;
  margin: 0.5rem;
}
button {
  padding: 0.5rem 1rem;
  font-size: 1rem;
  cursor: pointer;
}