Change the appearance of the dash icons

Hello, I am writing to ask a question…
Is it possible to edit gnome-shell.css or gtk-3.0.css/gtk-4.0.css to change the desktop appearance so that active application icons have borders around them?

I want it to look like this image, which shows three icons: one for an open but minimized application, one for a currently open application, and one for a closed application.

I captured this image by hovering the mouse over the minimized icon; without the mouse focus, the icon looks dim, just like the third one.

I already tried adding:
.app-well-app:active .overview-icon {
edit code
}

but it didn’t work.

Is it not possible?

The dash is an extension, it might have its own CSS…

Check out Dash to Panel in Gnome extensions, lots to play with there!

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There is no image, just a “postimage” ad to upgrade to premium for embedding. You can upload images to Discourse; it’s just a little spotty at times. (Re)try multiple times; seems easiest to just paste an image from the clipboard, because one doesn’t have to go through the selection dialog.

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Same here. Guessing its some top secret stuff :detective:

Funnily, I see the image on my phone:

But not on the desktop:

Off-topic, but thank you for this! I didn’t know that it was possible, and it works a treat.

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Now seeing the OP’s icons, this can be achieved using the Dash to Panel extension in Gnome extensions.

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Perhaps the OP will respond sometime?