Qr-code-component, responsive on all screen

Making the website responsive was one of the big issue i faced during this project, i had no idea of how to make the mediaquery work, so i ignore it. I love to go learn it better.

I'm also unsure of some of the declarations i used to achieve some result, if they are really what is need to do that e.g position the card in the center, spacing between element, where to use padding or margin.

It was funny doing my fast challenge, definitely gonna do better in the next.