A line next to the selected tabs

[Holyhestia]

Hi. How do I add a line next to the tabs as seen in the picture? I want this line to appear next to the opened tab.

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Here is my public share link: LINK
(how to access public share link)

[Port_of_Folio]

With the tab selected in the “current” selector, add a left border style

[Holyhestia]

Thanks a lot, this helped!