Static QR Code Component Page

I have a few question regarding my code and its readability:

• Is there something I am overengeneering in the code, like writting more to do the same thing;
• Is the code well readable? Or it is a little nested?
• Tips in how to center and move objects on CSS, this is one of things I found the hardest in front-end.

I appreciate any help on these questions or other feedbacks.