When I put `rotatediv` as a custom CSS class on an input in Form Builder,
and add your CSS to a file I point to with the `oxf.fr.css.custom.uri.*.*`
property, I get the following: rotatediv.png
<http://discuss.orbeon.com/file/t119778/rotatediv.png> . Are getting a
different result? If not, did you expect something different, or did I
misunderstand your question?
Certainly, I've put the source of the form, copied from Form Builder on
Orbeon Forms 2019.1, along with the CSS file that I've referenced from
`<property as="xs:string" name="oxf.fr.css.custom.uri.*.*"
value="/forms/assets/style.css"/>` in my `properties-local.xml`.