Reduce space between header/title and content

Hello,

I am using the Zillah theme to build my site. (I’ve created a child theme importing the main Zillah code so that I can edit the CSS code without modifying the parent theme.) Currently, there is quite a bit of white/grey space between the site’s main title/header (I’m not sure which it’s called) and the subsequent content. This is true both for my homepage (set up to show the most recent posts rather than a static front page) and for individual posts. I’d like to reduce that space.

I was able to modify the text case and character spacing of the header/title by modifying the .site-title class (via text-transform and letter-spacing), but the “padding” and “margin” functions have no effect there, even with “!important!” appended. I’m not sure if I should be working within .site-title or some other class like .site-header.

Please advise. Thank you.

– Jeremy

P.S. I’m using the Under Construction plug-in while building the site, so I can’t send anyone a working link, but I’ve changed virtually nothing in the child theme thus far, so I don’t think that the details of my page would be especially helpful in resolving this issue.