My index.html is in a folder "src", so my Github page is not correct, but I can't move the index.html from the folder to the root
(I made a topic for this but no answer yet)
I've got the same problem - https://suwebdev.github.io/user-science-blog/ doesn't work, but https://suwebdev.github.io/user-science-blog/index.html does
Tested on chrome and safari.
I tried clearing cookies.
I just took a look and both of those URLs appear to be working for me. Are you still experiencing this issue?
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Your problem might be because there is also a Readme.md file present. Try to delete .md file and verify