UltimateWB is very flexible. You can add php/mysql/js/html/css coding. CSS coding is best added to the Styles Manager. On the add/edit pages you can add/edit the html (click on the HTML button on the page editor box). And the Ad(d)s section of your admin panel is good for including more advanced coding if you would like, including even inserting files of code, such as doing <? include "file.php";?>
Here is the Ad(d)s section of the User Manual: https://www.ultimatewb.com/adds-app .