Table of Contents no background

Is there a way to set the table of contents to have no background so that it is transparent? When i select the clear button and save my page, the background value is not cleared on refresh.

The backgound color appears to be set at the uagb-toc__wrap child div, but the option to set a custom css class is at the parent wp-block-uagb-table-of-contents div.

The page I need help with: [log in to see the link]