@chezwells OK i’ll explain the problem…
Those tabs are created by jQuery UI .tabs() but the theme or maybe a plugin that create them don’t use any jQuery UI styles sheet so they come out looking very plane, for GD we use a jQuery UI style sheet because otherwise some elements would be broken like the datepicker.
So because those tabs are jQuery UI elements and have all the CSS classes our styles affect it, we can’t change the class names because that’s just not how it should work and if we dont include the style then the datepicker etc will break. So i would say your best options are either re-style the tab to look how you want or add some JS that removes the jQuery UI classes on load.
You can see the default tabs should be styled like you see them with GD installed.
https://jqueryui.com/tabs/#default
Thanks,
Stiofan