Github pages not rendering CSS correctly as it is locally

Question

CSS Is not rendering as expected for the ReactApp as it is locally.

On Github

On Locally

Not attaching any code, however if you need any specific file, let me know will edit question accordingly.

EDIT

Answer 1

I seems the position: fixed was causing the issue:

Earlier:

.navbar-custom {
    z-index:100; 
    position: fixed;
}

Later:

.navbar-custom {
    z-index:100; 
    /* position: fixed; */
}

Also, please ensure to disable caching::