How do I make the top section thinner on this site?

Hi,
Wher it says “Manifesto” in fact the titles with the video background headers on all these pages are far too thick (except for the front page). How do I make them thinner – at the moment they take up half the page and I would like them just to be about 3cm thick or less,
tx

• This topic was modified 3 years, 10 months ago by Gusss.

The page I need help with: [log in to see the link]