body {
  font-family: 'Segoe UI', sans-serif;
  background: #121212;
  color: #0ff;
  padding: 2rem;
  margin: 0;
}

input, button {
  margin: 0.5rem;
  padding: 0.4rem;
  background: #222;
  color: #0ff;
  border: 1px solid #0ff;
  border-radius: 4px;
  cursor: pointer;
}

button:hover {
  background: #0ff;
  color: #000;
}