Remove Top Margin from 80px to 10px

Hi

I would like to remove the margin/padding at the top of the pages. I have changed the margin-top 80px to 10px but on a mobile it breaks the site.

Would it be possible to provide the correct css so the theme will look correct on both desktop and mobile by having 10px as the top margin.

Many thanks – love the theme by the way!

Justin Callaghan

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