Is it possible to apply css style to annotations?

Hello Logan,

I am trying to use pdf.js express to customize UI for pdf editing.
However, it seems like it is using pdftron codes.
I would like to know if pdf.js express license would allow me to use pdftron codes for customization.
Also I am getting watermark “PDFTRON” for all pdfs.
I would like to know if I buy pdf.js express license, the watermark will not be displayed.

Please let me know.
Thank you,

Jungsoo Yang