The page loses all styles

[yupngli]

This is my index page: yupngli.github.io( I have changed the domain).
The link above is also the repository.

But this index page loses all css styles.
The relevant repository is:

yupngli/statlearn

(Because I am new here, I am only allowed to put 2 links in my first post)

I used the theme named “coder”.

Could someone help me with this?

Thanks a lot!

[zwbetz]

Look at these console errors in DevTools