[hrbrmstr]

That particular page appears to have been created with "Unbounce" (https://preview.unbounce.com/) (the "lp-*" strings give that away). If you look for said "lp-" strings on the web there are more than a few pages using them. Unbounce is primarily designed for creating HTML email that won't break and won't get auto-rejected and it's likely easier for the builder program to stick in hardcoded values in-tag than to rely on complex CSS, especially with the varied capabilities of mail clients.