Tool tip styling in Dash To Panel

Ubuntu 22.04 LTS
GNOME

Hi
I’m trying to style the tooltip pop up in Dash To Panel to remove the rounded corners (see screengrab). I assume this is done via CSS.

I’ve managed to target tooltips within my theme via gtk.css stylesheets in /.config/gtk-3.0 and 4.0 but this doesn’t affect the Dash To Panel tooltips… I tried to edit the stylesheet in /.local/share/gnome-shell/extensions/dash-to-panel@jderose9.github.com but I think using the wrong code in the CSS-

.tooltip {
border-radius: 0px
}

Can anyone guide me?

Thanks

tooltip

A cursory look at the stylesheet.css of that extension shows several rules that set ‘border-radius’ and are marked as ‘!important’. Could one of them possibly override your rule ?

Thank you for the reply. I tried setting all the border-radius rules to 0 but unfortunately that didn’t work