Even though some of your questions go a bit beyond the typical support, I’m happy to respond.
1. My plugin does not add css borders to any of its elements. The borders that you are seeing are probably being added by css from your theme. You can override them by identifying the element the border is being added to, targeting it more specifically than the the code that adds the border and applying a border of “none.” For example, if there is a border being added to the branding images that you upload, you could do this:
#wpbb-main-branding img {
border: none;
}
If you give me the url of your site, I’d be glad to give you the exact css you need. However, without the actual code in front of me, I can only guess as to what targeting you will need.
2. Yes. Something like this should work:
body #wpbb-branding-header-wrapper #wpbb-branding-inner {
background: #000;
}
3. No. Not without a lot of tricky javascript. By the time you wrote the code you needed to make it work, you could probably have found yourself a plugin that does more exactly what you need.
Best Regards,
Stacy