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How to partially override my GTK theme? I want to add a highlight to the current tab, but keep everything else

The css theme I'm using is Cascade FYI

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Thank you! I added a line to your code and it worked!

.tab-background[selected="true"] {
      background-color: #171A26 !important;
      background-image: none !important;
    }

!firefoxcss

Pushing the limits of the Firefox Browser through the use of CSS.

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