I've looked at the "Shortcodes" on the Dashboard and see the comments within the CSS. However, is there a comprehensive reference somewhere that defines all the Shortcodes and CSS?

Having that would make it easier for me to edit the site.

For example, I want to remove the bottom border underneath the logo on the homepage, but I can't find what's controlling it.

I assumed it was heading, but this is the only heading reference I see, and that's not it.

.su-heading-style-default {
	padding: 2px 0;
	border-top: 1px solid #999;
	border-bottom: 1px solid #999;
}
.su-heading-style-default .su-heading-inner {
	padding: 1em 0.5em;
	border-top: 4px solid #eee;
	border-bottom: 4px solid #eee;
}

Thanks