How to have one solid background color on all the form tabs?

The last question I have is about having one solid background color behind all of the tabs so there isn't a jagged edge to the top menu background. See attached screenshot for better explanation of this issue.  Sorry if these issues are not really explained correctly, not sure the technical names for everything

If I understand correctly, you want to cover the entirety of the form tabs in one background color? Please add the CSS code below into the custom CSS area of the Form Tabs widget.

#tabs-list {

    background: #60635c;

}

Here's the result:

If you need further assistance, please let us know.
Regards.

Perfect, thanks!