Issues with Blooog & the "more" button

My blog page is set up to show article summaries with image using <--more--> in the HTML of individual posts. (Blog is at waynegreenwood.com)

When I use...

<?php the_content('more'); ?>

I see a small, blank, colored rectangle. No text is visible, possibly because it's button-colored text. The "more" text IS visible on rollover.

If I use...

<?php the_content('<span class="button">more'); ?>

Then I see the expected Blooog-themed button with a "more" label, but the original colored rectangle is still present underneath & poking out from the side.

I would be happy with either a simple text link for "more" or a small-size Blooog button. How do I get this to work?

Thanks!