QR Newbie Challenge using basic HTML and CSS

First challenge. A good practice to cement down concepts I learned these past days

Had a hard time: -Positioning the divs where I wanted to: vertical and horizontal centering. -Playing around with the pixels to make it look like I wanted it to

-Is there a better/easier way to position the divs?

I'm not sure about the excessive use of classes. For this small challenge is easy because there are so few elements.. I'd appreciate any advice so I get use to best practices and avoid issues with larger projects/challenges.