Bootstrap is not working ,html multiple pages

Hi campers,I am creating an app using webpack,in the entry file I have links that take the user to other html pages ,every thing seem working I can go back and forth usign relative paths but when I use in history.html boostrap table ,it did not appear ,although it is working in my entry where I have bootstrap modal , by the way I installed bootstrap using npm package and I imported it in the index.js file
here is my repo code clone it for clear image :

I need help ,thanks in advance.