Shadow around booklet

Hey you guys,

I can’t share the page because it’s on a test server.

But I have the following problem: I added the booklet plugin, everything works fine, but the background color of the booklet and the web page have the same color (white) and it looks like they’re blent in.

https://ibb.co/brKcdw6

I wanted to add some shadows around the booklet itself. It already has some boarders but they’re very very thin. I couldn’t figure out how to make them bolder. Does anyone know how I can add shadows around the booklet or make the boarders of the brochure a bit bolder?

Thanks in advance!