body {
  background: black;
  color: white;
  text-align: center;
  font-family: sans-serif;
  margin: 0;
  height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
}

#opening h1 {
  font-size: 3em;
  margin-bottom: 20px;
}

#opening input {
  padding: 10px;
  font-size: 1.2em;
  margin-bottom: 10px;
}

#opening button {
  padding: 10px 20px;
  font-size: 1.2em;
  background: gold;
  border: none;
  border-radius: 8px;
  cursor: pointer;
}