I just followed the advice that Daniel gave above. It’s not user-friendly because you’re hacking into the site code, not just modifying the CSS. You have to know your way around php a bit. Do just what he said. Go to content-*.php in the editor and find the one place where it says “the_excerpt();”. Replace that with the code he provided above. A hint, it’s in the section called div class=”entry-summary” in the content-*.php file. And of course, please remember that any updates to the theme will overwrite any changes you make to the php and you’ll have to do them again.