Make sure that your Django project is set up to serve static files.
In your settings.py file, check that the STATIC_URL and STATICFILES_DIRS settings are correct and point to the correct location of your static files. You may also need to set the STATIC_ROOT setting if you are using Django's built-in static file server.
Check that your Django templates are using the {% load static %} template tag to include static files. The {% load static %} template tag should be included at the top of any template that includes static files.
Make sure that your CSS files are actually being served.
You can check this by opening the developer console in your web browser and looking for any errors or warnings related to the CSS files.
Check the path to your CSS files in your Django templates.
Make sure that the paths are correct and that they are relative to the STATIC_URL setting.
If you are using a static file management system like Django's built-in collectstatic command, make sure that the CSS files are being copied to the correct location and that the STATICFILES_STORAGE setting is correct.