Social Proof Challenge - Mobile and Desktop ready with flexbox

Hi there!!!

I'd appreciate some feedbacks about my job with this challenge.

Also I've a few questions::

1. I'd like to ask wether the media queries makes sense or there is a best practice to avoid so many break points (probably the mobile first approach would have helped, right?)
2. Any idea why I was not able to apply align-content: space-around to the header__right in order to vertically align the boxes .header__right-box?

Thank you very much in advance for your feedbacks!