I can help you with the background part. Do you have a link to your site so I can see exactly what line in your css will need to be adjusted?
Have you seen the after entry widget example they have on the Epik demo site? Take a look at one of their posts to get a feel for what it looks like – http://demo.appfinite.net/epik/2013/08/13/hello-world/ it stars out with a black background which can be adjusted from line 2411 by default –
.after-entry {
background: #222;
color: #aaa;
margin: 60px 0;
overflow: hidden;
text-align: center;
}