message: Match `file-finder-buffer` style with GitHub
diff: @@ -31,7 +31,7 @@ function pjaxStartHandler(event: CustomEvent): void {
  const repoName = select('.pagehead h1 strong, [itemprop="name"]')!;
  repoName.classList.remove('mr-2');
  repoName.after(
  - <span className="mx-1 flex-self-stretch">/</span>,
  + <span className="mx-1 flex-self-stretch color-text-secondary">/</span>,
  <span className="flex-self-stretch mr-2">{bufferField}</span>,
  );
  bufferField.focus();
  