[Theme: Adventure Journal] background / plugin trouble?

Hi! I added Q&A Lite plugin to my blog, and when I clic it, I think I have a problem with the background of the theme, haven’t I?

Look please and help, give me some ideas…
https://pisapapeles.com.ar/questions/

Thank you everybody,

Richy

https://www.ads-software.com/extend/themes/adventure-journal/