Css not working in githubpages

https://michisha.github.io/firstwebpage/
this is my page and for some reason on my pc the website work great but on github server its dosent load the css

Hello,

Looking at your repository I noticed that there are missing folders for the correct functioning of your site.

I recommend checking that there are no missing content uploads on your branch.

Example: your .css files are coming from the vendor folder and it doesn’t exist in your repository.