There are at least two different
<h1> examples on the page. The one that says 'speciality imports', and then the list of beer names further down. Different styles apply to these in each case. However, what they do have in common is that altering the right margin will not make any difference to their position. Examining the effect of altering the margin in Firebug will demonstrate why this should be so.
What is it that you're trying to achieve? If you can tell us that, we may be in a better position to help.
The theme uses tables for layout, as well. That's unfortunate, since most developers have moved away from this misuse of the
<table> element, these days. But you may not have any control over that, if it came with your theme...
I would also venture to suggest that using the
<h1> tag for the lists of beers is not the best of practices, since it's hard to imagine in what sense they can be said to be level one headings. However, I can see that the effort needed to find another solution might put you off from changing that.