A free extension like this survives only by reputation. You can help by submitting a review in the Joomla Extension Directory. Please take the time to make a review by clicking on the link below (opens in a new window)
OK, the system message type styles are controlled by your template. My plugin can't affect those styles - that's your template.
The module displaying a blank (I'm guessing you mean some kind of empty box) is also a function of your template. You can try putting the module somewhere else - like the debug position (usually at the bottom of the page if your template implements debug)