how to move content UP closer to menu buttons

Hello all, I am trying to move the content on all my pages UP so that the page content is closer to the menu buttons, to reduce the blank space. I have Simple Custom CSS installed. I have tried various pieces of CSS code but none of them have worked. I’d be really grateful if anyone could resolve this. My site is https://www.oilandgasposts.com. For example, on the home page, I want the line ‘Oil and Gas Posts is an international recruitment consultancy specialising in the supply of professionals to the Oil & Gas sector.’ to move up closer to the menu items.

very much appreciated