body {
  font-family: monospace;
  background: #f5f5f5;
  color: #333;
  padding: 20px;
}

textarea {
  width: 100%;
  height: 200px;
  background: #fff;
  color: #000;
  border: 1px solid #aaa;
  padding: 10px;
  font-family: monospace;
  font-size: 14px;
}

button {
  background: #007acc;
  color: white;
  padding: 8px 16px;
  border: none;
  margin: 5px 5px 5px 0;
  cursor: pointer;
  border-radius: 4px;
}

button:hover {
  background: #005a9e;
}

#output {
  margin-top: 20px;
  display: flex;
  background: #fff;
  border: 1px solid #ccc;
}

#lineNumbers {
  background: #eee;
  color: #666;
  padding: 10px;
  text-align: right;
  user-select: none;
  min-width: 30px;
}

#formattedCode {
  white-space: pre-wrap;
  padding: 10px;
  flex-grow: 1;
}