I hope you already found a solution. If not, I have a few ideas.
- Check your browser’s dev tools for errors and other clues about why the styles are missing. There could be a 404 on a CSS file, an error logged in the console, or other clues in the page source.
- Append the special path
/_srcto your deployment and check the Source and Output to verify the CSS file exists where you expected it. - Use the Debugging 404 Errors tips to investigate further.