Why is my bootstrap website not responsive after uploading it in github?

BEFORE GITHUB PAGES:
shakilliatk_beforegithub

AFTER GITHUB PAGES:
shakilliatk_aftergithub

I created this site using bootstrap.  I had decided to upload it to github pages. Beforehand, it was responsive. Now it isn’t. I tried to figure out what was going on and noticed that there might be an issue with the javascript since my hamburger menu wasn’t showing up as it should. I opened the developer tools and found this error message in the console.

" Error in response to storage.get: TypeError: Cannot read property ‘style’ of null
at Object.callback (chrome-extension://kchdfagjljmhgapoonapmfngpadcjkhk/js/scripts.js:24:42)
at chrome-extension://kchdfagjljmhgapoonapmfngpadcjkhk/js/scripts.js:11:21 "

Apparently, the error is talking about an extension in my browser. However, I’ve already tried looking at this same site on other browsers aside from chrome and I am still having the same issue. 

I attempted to make a separate physical script.js file but the code still didn’t work. Here is the code that the error message is pointing to:

shakilliatk_github

here are all the links in the index.html file. I’m linking bootstrap files through CDNs. There are no physical js files in the directory aside from the script.js file I made which wasn’t present when the issue started.
shakilliatk_github_index

link: www.shakilliabobo.tk

Please, I need help. Is there some sort of javascript from github’s source code that may be interfering? 

You use an iframe to get the domain name. That is the problem. Do not do that. You should do it like this: https://help.github.com/articles/using-a-custom-domain-with-github-pages/

I opened up the Chrome debug tools after going to your site at http://www.shakilliabobo.tk/. The Console tab showed multiples of the following message:

Failed to load resource: the server responded with a status of 404 ()

referring to files script.js and painted-textured-background.jpeg. Either one of those missing files could be part of the problem. In addition, there was the following messsage:

Uncaught DOMException: Failed to read the 'sessionStorage' property from 'Window': Access is denied for this document.
    at Object.ra.getAndResetPendingTask (<anonymous>:70:31439)
    at a.addPendingTask (<anonymous>:66:8534)
    at D (<anonymous>:65:17877)
    at c (<anonymous>:65:18398)
    at d (<anonymous>:64:8456)
    at <anonymous>:64:8721
    at q.d.promiseDispatch (<anonymous>:64:2730)
    at <anonymous>:64:1493
    at MessagePort.c (<anonymous>:64:6156)

In searching the code you have in your repository, I can’t find anything referring to sessionStorage, so I have to assume that it is either jQuery or the Google Analytics scripts that you’re running that is throwing that error.

I hope that helps you narrow down the problem.

could you help me my bootstrap file is not working when i uploaded my code on github .