Issue in changing the background color of Bundler App

[pritom]

Hello readers,

I am using BUNDLER, an app for creating bundle offer for my shopify store. I want to change the background colour of the app section to match my theme colour. But I can not find any options for this.

This is the color settings of the bundler application. 

And I want to apply same color on my theme and app section. How can I do it ?

Thank you for reviewing my issue.