I compiled the relevant files with gulp. Why did, github pages report an error after uploading to git?

I compiled my scss file with gulp, which can be uploaded to github, but, github pages shows 404?
the query is shown in the picture: because it is a rookie, please give me an explanation?

clipboard.png
githubnode_modules

clipboard.png


1. node_modules do not upload
2. You can create a .gitignore in the root directory, ignoring unnecessary uploads

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