def add_tailwind_to_css_file(css_file_content: str) -> str:
    """Add tailwind to the css file.

    Args:
        css_file_content: The content of the css file.

    Returns:
        The modified css file content.
    """
    from reflex.compiler.compiler import RADIX_THEMES_STYLESHEET

    if Constants.TAILWIND_CSS.splitlines()[0] in css_file_content:
        return css_file_content
    if RADIX_THEMES_STYLESHEET not in css_file_content:
        print(  # noqa: T201
            f"Could not find line with '{RADIX_THEMES_STYLESHEET}' in {Dirs.STYLES}. "
            "Please make sure the file exists and is valid."
        )
        return css_file_content
    return css_file_content.replace(
        f"@import url('{RADIX_THEMES_STYLESHEET}');",
        Constants.TAILWIND_CSS,
    )
Add tailwind to the css file.

    Args:
        css_file_content: The content of the css file.

    Returns:
        The modified css file content.
    
reflex/plugins/tailwind_v4.py