body {
  font-family: sans-serif;
  background: #eef2f3;
  padding: 2rem;
  color: #222;
}
input, button {
  margin: 0.5rem 0;
  padding: 0.4rem;
}
pre {
  background: #f0f0f0;
  padding: 1rem;
  border-left: 5px solid #007acc;
}