Form Tabs

I have 3 Tabs on the form like below

[ATTACH=JSON]{“data-align”:“none”,“data-size”:“full”,“title”:“2018-11-01 13_09_35-main_menu.jpg”,“data-attachmentid”:85323}[/ATTACH]

How can I make the Tab in use Highlighted (or have different background) so user knows which is selected ?
I see no setting for that

2018-11-01 13_09_35-main_menu.jpg