PDF Export: Preliminary CSS modification

[xolotl]

Can we implement the following preliminary PDF CSS rules to see how the PDF output looks to the designer from there for another round of adjustments? Ideally we'd use the following course currently on Production as a sample if it's possible for you to get that into your dev/test environments:
https://courses.candelalearning.com/collegesuccess2x30master/

<h1>, Book Title and Part Title: Ostrich Sans, 50pt, line space 60pt, centered
<h2> and Page Title: Decour Semibold, 36pt, line space 43pt
<h3> and Styled Boxes Title: Decour Semibold, 20pt, line space 24pt, centered (centered only in Styled Boxes)
<h4>: Decour Semibold, 14pt, line space 13pt
<h5>: Decour Light, 10pt, line space 13 pt, centered
<h6> and Image Captions: Decour Light Italic, 9pt, line space 13pt
<p> and all normal body text: Decour Light, 10pt, line space 13 pt

PDF Page Margins:
outside: 42mm (ie, right margin of odd pages, left margin of even pages)
inside: 34mm (ie, left margin of odd pages, right margin of even pages)
top: 22mm
bottom: 50mm