Perfume responsive

Hello team! hope you are doing fine.

This is my 2nd challange i did for frontendmentor.io

I have a couple questions.

A) I couldnt make the border radius on the pictures as the example you sent me.

B) i couldnt get the text in the same way you sent me

C) im having issues to leave the card in the middle of the page. Same with the last challenge (the qr code one), i had to watch a youtube video and in one the guy was using the

min-height: calc(100vh - 1px);

and in the other one

max-height: calc(100vh - 1px);

Im really confused on how it works, do you have any tip to understand it?

Thanks!!!