All solutions

This already my second submit with you guys, and i was lucky in the first that i've had some nice advices from a guy and it helped a lot in this one , so I would like to get any advices , thanks !

Hey , My name is Mouhib Moughtanim, i'm a beginner and i would like to learn more about creating websites , so when searching about the best methods to learn i've found that practicing is that method and the best place to do that is with you guys at frontend mentor , but i've found hard is how to choose the measures for padding and margins and the types to us(em,rem,..) , and this case i was charged to center the card inside of this layout , so i've tried to use flex-box i dont know if there is better solution than that... so i'm down to get any advice to improve my skills thanks.