You Have an Html, Css and Js files in your computer and you want to show it to your colleagues ?
Github Has an amazing static site hosting service that takes HTML, CSS, and JavaScript files straight from your repository

Lets go to the steps:

1- Create a repository with your username followed by .github.io

in my case my username is BegDevv, so the repo name would be BegDevv.github.io :

2- Upload your static files into that repository (Html/Css/Js)

you're done 💯 ❤ github will host your files in that repo automatically Go to https://{yourusername}.github.io (change yourusername with yours)