QRProject using flex-box on visual studio.

First project, I had a difficult time with padding, margin, heights, and widths. Specifically, the white space around my QR image was not as close as I would have liked it to be (I tried to reduce the amount of white space surrounding the content boxes). I played around with the padding and content area widths, but I could not get it to match the desired sample image on the project page. Feedback on this issue would be appreciated. Thanks.