How to change XFCE panel's of notify and audio icon size

xfce-panel-icon-size.md

This is a way to change notify and audio icon size for XFCE panel:

Create or edit ~/.config/gtk-3.0/gtk.css, and add these two selectors:

#pulseaudio-button * {
        -gtk-icon-transform: scale(.55);
}

#xfce4-notification-plugin * {
        -gtk-icon-transform: scale(.55);
}

Save the file and restart XFCE panel using this command below:

$ xfce4-panel -r

Still working in 2023 ! :)

I had choice between ~/.config/gtk-3.0/ and ~/.config/gtk-4.0/. I tried to put the configuration in gtk-4.0 without success, but works perfectly in ~/.config/gtk-3.0/!

I also used that configuration to reduce the size of power manager icon:

#xfce4-power-manager-plugin * {
        -gtk-icon-transform: scale(.55);
}

Still working in 2023 ! :)

I had choice between ~/.config/gtk-3.0/ and ~/.config/gtk-4.0/. I tried to put the configuration in gtk-4.0 without success, but works perfectly in ~/.config/gtk-3.0/!

I also used that configuration to reduce the size of power manager icon:

#xfce4-power-manager-plugin * {
        -gtk-icon-transform: scale(.55);
}

I'm glad to hear it :)
And thank you for the tip about power manager icon.

It Works! Thanks.

And to reduce the size of "Show Desktop" icon, use:

#showdesktop-button * {
        -gtk-icon-transform: scale(.55);
}

It Works! Thanks.

And to reduce the size of "Show Desktop" icon, use:

#showdesktop-button * {
        -gtk-icon-transform: scale(.55);
}

Yes, thank you.