function RuntimeErrorHeader(document, root, props) {
  const header = document.createElement('div');
  header.innerText = `Error ${props.currentErrorIndex + 1} of ${props.totalErrors}`;
  header.style.backgroundColor = theme.red;
  header.style.color = theme.white;
  header.style.fontWeight = '500';
  header.style.height = '2.5rem';
  header.style.left = '0';
  header.style.lineHeight = '2.5rem';
  header.style.position = 'fixed';
  header.style.textAlign = 'center';
  header.style.top = '0';
  header.style.width = '100vw';
  header.style.zIndex = '2';

  root.appendChild(header);

  Spacer(document, root, { space: '2.5rem' });
}
A fixed header that shows the total runtime error count.
@param {Document} document
@param {HTMLElement} root
@param {RuntimeErrorHeaderProps} props
@returns {void}