Styling error on Wordpress theme, after deploying to Github Pages

Hello, I'm not sure if this is the right channel for this question but hope someone can help. I've used the Simply Static plug-in to compress my Wordpress theme to HTML, so I can deploy to Github pages. However, the site has broken styling whereas just the index.html opens fine. The issue is only when opening the link to the site: https://alanrobert.github.io/the-butty-bar-static/ This is the link to my repo: https://github.com/alanrobert/the-butty-bar-static I have also attached an image of my setting for converting to html in Simply Static plug-in.

GitHub

GitHub - alanrobert/the-butty-bar-static

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