Linux puskom-ProLiant-DL385-Gen10 5.4.0-150-generic #167~18.04.1-Ubuntu SMP Wed May 24 00:51:42 UTC 2023 x86_64

/usr/share/themes/Ambiance/gtk-2.0/apps/

//usr/share/themes/Ambiance/gtk-2.0/apps/mate-panel.rc

 # Panel specific settings for correct theming on MATE

style "panel" = "dark"
{
	xthickness = 0
	ythickness = 0

	engine "murrine" {
		colorize_scrollbar = TRUE
	}
}

style "panel_default" = "dark"
{
	engine "murrine" {
		colorize_scrollbar = TRUE
	}
}

widget "*Panel"                   style "panel"
widget "*PanelWidget*"            style "panel"
widget "*PanelApplet*"            style "panel"		# workaround for right click menu corrupted bg
widget "*fast-user-switch*"       style "panel" 	# workaround for Fast User Switch applet
widget "*CPUFreqApplet*"          style "panel" 	# workaround for CpuFreq Applet
class "PanelApp*"                 style "panel"
class "PanelToplevel*"            style "panel"
widget_class "*notif*"            style "panel"
widget_class "*PanelApplet*"      style "panel_default"	# workaround for right click menu corrupted bg
widget_class "*Tray*"             style "panel"		# workaround for StarDict, gnubiff... tray icon bg