Four-card-Feat-section-worked on responsive and breakpoints

Not sure if I made well the responsive part - anyway I wanted to practice that side of the web project, but in fact I have started by making for larger screen and I know it is best practice to start by mobile first.

There's one problem I can't explain, as on my computer, the view is ok, but when I submitted my solution, it doesn't appears correctly..need to look at it I am looking forward for another challenge to practice mobile first at the start of the project, but if you have any advice or also feedback, it will be cool 😉