How do I reduce padding and leading in main content?

Hi - a simple question (I hope!)

I am designing a site at In the main content box I have two heading 'Invest in the next Google' and 'Featured investments'. There is a lot of space around these headings and I want to reduce the space so that the orange content section looks like two orange bars at the top and bottom of the ,jpeg that for the content.

I am guessing it is a combination of the padding of the content and the line spacing of the font.

How do I change these in the css please?

Regards, Paul