A — red = top:56px, blue = top:3.5rem (must be the same line)

B1 — section header with top:56px

B2 — the same with top:3.5rem, as the site writes it

C — widths: 16px, 1rem, then 56px (red) vs 3.5rem

Rows 1&2 must match, rows 3&4 must match.

D — the same x10: 160px vs 10rem, 560px vs 35rem

Red is px, green is rem. Divide any overhang by 10 (resp. 35) to get the error in one rem.