Single price grid component with pure HTML and CSS

Hi, thank you for checking my solution! Here are my questions. It would be great if you answer or leave any suggestions. Thank you :)

1. Are there any better ways to place the component itself in the center of the entire page?

2. How would you make a space around in each section?

   • I set the padding for each to colour them, and put box-shadow to the whole. You can find the tiny edges on the bottom corners...they don't look pretty.

3. I still don't get used to the elements overflowing from its parent's element...am I missing something to know to get this fixed? Any suggestions to learn about this?