CSS Flex Box and semantic html 5

What are you most proud of, and what would you do differently next time?

this is my first challenge in frontend mentors i completed my QR code project easily with extra grip on flex box i want rating on my code in out of 10 also i want to know where should i improve my self

What challenges did you encounter, and how did you overcome them?

main challenge was to face was center a div for that i used youtube and some help from https://w3schools.com after all i am still facing some problems to naming css classes

What specific areas of your project would you like help with?

as beginner idk about that