code: def _render_css(self) -> str:
      return CSS_RESOURCES.render(
          css_files=self.css_files, css_raw=self.css_raw
      )
  
imports: from __future__ import annotations
  import logging
  import hashlib
  import json
  import os
  from dataclasses import dataclass
  from os.path import normpath
  from pathlib import Path
  from typing import TYPE_CHECKING, Callable, Iterator, Sequence, TypedDict
  from urllib.parse import urljoin
  from ..core.has_props import HasProps
  from ..core.templates import CSS_RESOURCES, JS_RESOURCES
  from ..document.document import Document
  from ..resources import Resources
  from ..settings import settings
  from ..util.compiler import bundle_models
  from .util import contains_tex_string
label_desc: Use image node_id 4 for calling the Bundle obj's underlying member method code with example usage: obj._render_css() and returns: CSS_RESOURCES