PDF background-color css in Beta 29

[iseexuhs]

in Zotero Beta <=29, I use the following css to change the background-color of PDF.

.textLayer{display:block !important;background-color: ${bgColor} !important;}

But in Zotero Beta 29 and later, the css fails. I checked the source cods, but did not figure it out yet.

Would please the Zotero Team tell the what css I should use now?

Thanks very much.

[Muise Destiny]

The new version of Zotero's pdf viewer exists under an new iframe (pdf/web/viewer.html), and the css of the iframe's parent document cannot act under the new iframe.

[iseexuhs]

Thanks for your help.