I am by no means a css expert. But yes if a property is blank it will inherent a default value somewhere. If you go through each section of the properties you will see the view on the right change. The hard part is sometimes it is not clear what property does what because the terminology is different from one side to the other. So you have to play with the settings to figure out how it changes what.
Also at the top of the screen is a note about browsers. If you are not using the suggested browser the preview may not work correctly.
IF you would prefer how I changed the ubbcentral style at the IAEI I can export it and send it to you.
Just send me a private message at this site and note where to send the file.
