Ok we’ll do it the quick way then - although not the best way to do it.
Go back into your {{content-box}} chunk, and where it says...
<markdown>[*content*]</markdown>
...change it to:
<div style="margin-top: 2em;">
<markdown>[*content*]</markdown>
</div>
However without seeing your stylesheets there is a chance this could mess up your site layout, in which case just revert back. If you want more space, change the ’2’ to 3 or more until you are happy with it.
If you’re planning to make a lot of changes to the site, you might want to hire a designer