With this stack you can make a warningbox, contactbox, styled box and so on. Make your own close button or contentbackground or titleblock (or use the many build-in styles - see manual). Knowledge of image editing are necessary to create your own styles.

For those who are not so handy (to make your own styles) just use the predefined styles. There are many standard styles available.(follow the manual to link your own style). If you succeed in doing that you can make whatever you want (see examples on this site). Attention: self made styles don't show on your workdoc - only on preview and publish

As you allready figured out, it's a very powerfull stack but on the other hand also very simple to use.