body {
  font-family: system-ui, sans-serif;
  padding: 40px;
  background: #f5f5f5;
}

textarea {
  width: 100%;
  height: 120px;
  margin-bottom: 12px;
  padding: 10px;
  font-size: 14px;
}

button {
  padding: 10px 16px;
  font-size: 14px;
  cursor: pointer;
}

pre {
  margin-top: 20px;
  background: #111;
  color: #0f0;
  padding: 15px;
  overflow: auto;
}