body {
  font-family: sans-serif;
  background: #111;
  color: #fff;
  padding: 20px;
}

input, textarea, button {
  width: 100%;
  margin: 10px 0;
  padding: 10px;
  background: #222;
  border: 1px solid #333;
  color: white;
}

button {
  background: #00aaff;
  border: none;
  cursor: pointer;
}