body {
  font-family: Arial, sans-serif;
  max-width: 800px;
  margin: auto;
  padding: 20px;
  background: #f6f7fb;
  color: #0b1320;
}

h1 {
  color: #4f46e5;
}

textarea {
  width: 100%;
  height: 200px;
  font-family: monospace;
  font-size: 14px;
  padding: 10px;
  border: 1px solid #ccc;
  border-radius: 6px;
}

iframe {
  width: 100%;
  height: 250px;
  border: 1px solid #ccc;
  margin-top: 10px;
  background: white;
}

button {
  margin-top: 10px;
  padding: 8px 14px;
  background: #4f46e5;
  color: white;
  border: none;
  border-radius: 6px;
  cursor: pointer;
}

button:hover {
  background: #3730a3;
}