body {
  font-family: Arial, sans-serif;
  background: #111;
  color: #fff;
  text-align: center;
  padding: 50px;
}

input, button {
  padding: 12px;
  margin: 10px;
  width: 60%;
  border: none;
  border-radius: 5px;
  font-size: 16px;
}

input {
  background: #222;
  color: #fff;
}

button {
  background: #00cc66;
  color: #fff;
  cursor: pointer;
}