HTML 5, flexbox, grid system, SASS, Bootstrap

Hi Dytoma Batogouma, how are you? Welcome to the front-end mentor community! I really liked the result of your project, but I have some tips that I think you will enjoy:

If we see how the layout is behaving at higher resolutions, with the help of google dev tools, we will see that it is stretching a lot, to solve this we can use a max-width with the value we want the content to stop growing and to center use a margin: 0 auto;

body {
  max-width: 1440px;
  margin: 0 auto;
}

Avoid using <hr> and use border-bottom instead!

The rest is great!

I hope it helps... 👍