Single post in Site Skins: How-To, and Helpful CSS

Hi, I've had a scan through and can't see if anyone has asked this. I only went back about 20 pages, I'll admitt! I use the kind of app for pokefarm and after changing all the colours for the skin. It only works on half the site, yet when I open it in the web browser, it has worked correctly in full. Is this something to do with the app? Thanks so much! Edit - I think it just took a bit longer to think about it! It's just switched over now haha. One more quick question though, is there a way to change the colour of the boxes? EG. The field boxes and the boxes such as the 'edit, preview, etc' that are in the forum? They are the standard grey at the moment. Hope that makes sense!