code: def reset_default(verbose=False):
      
      paths = [jupyter_custom, jupyter_nbext]
  
      for fpath in paths:
          custom = '{0}{1}{2}.css'.format(fpath, os.sep, 'custom')
          try:
              os.remove(custom)
          except Exception:
              pass
      try:
          delete_font_files()
      except Exception:
          check_directories()
          delete_font_files()
  
      copyfile(defaultCSS, jupyter_customcss)
      copyfile(defaultJS, jupyter_customjs)
  
      if os.path.exists(theme_name_file):
          os.remove(theme_name_file)
  
      if verbose:
          print("Reset css and font defaults in:\n{} &\n{}".format(*paths))
docs: Remove custom.css and custom fonts