body {
  background-color: #0d1117;
  color: #c9d1d9;
  font-family: sans-serif;
  text-align: center;
  padding: 2em;
}

textarea {
  width: 90%;
  height: 200px;
  margin-bottom: 1em;
  border-radius: 6px;
  padding: 1em;
  font-family: monospace;
  background-color: #161b22;
  color: #c9d1d9;
  border: 1px solid #30363d;
}

button {
  padding: 0.6em 1.2em;
  font-size: 1em;
  background-color: #2ea44f;
  color: white;
  border: none;
  border-radius: 6px;
  cursor: pointer;
}

iframe {
  width: 90%;
  height: 300px;
  margin-top: 1em;
  border: 1px solid #30363d;
  border-radius: 6px;
}