I want to do cool CSS stuff like I know how to do on the web but UI builder is not playing ball

here's a simple example of what you can do with css : http://apps.eky.hk/css-triangle-generator/

here's how that looks in UI builder (the CSS ordering norms are not respected by unity and that is already a big issue) (((it's supposed to be "TOP, LEFT, BOTTOM, RIGHT" for border width))) :



Also all of my USS classes are ignored despite showing up here :