content container border not respected from Accordions PlugIn

Hi Support team,
I need your CSS experience & expertise … the border around a content container is not expanding correctly, if I use your Accordions PlugIn:
Here you can see the standard Webdesign the customer expects:
Link to [work in process] Website
But your PlugIn is not expanding the border to the end of the accordion area, independent it is closed or opened … what kind of css brings here the right solution?
Link to [disrupted, damaged] Website
This is happend everytime independent I am using your shortcode in a widget area, sidebar or in a Website Pagebuilder ... ;-(

Thanks very much for your support & assistance!
Best regards