html, css, responsive design

Hi, fellow coders!

I just started learning html and css, and I will admit it is quite a learning curve :D My specific question is: How can I solve the problem with adjusting the stats card in the mobile version? I couldn't add space below the card to move it up. I am pretty sure this is not the only issue with my code though :) Any suggestions on how to improve the scripts are greatly appreciated.

xoxo