Awesome theme but one issue

The theme is really great and looks amazing. But I don’t want so much gap between the images. If I edit the CSS, I have to select the option of not using the theme’s original CSS. It reduces the gap between images but overall layout gets spoiled. Please suggest a way of removing the excess gap while keeping the theme’s layout. Thanks.

(P.S. – for image reference check – http://www.thevagabondwayfarer.com )