MediaWiki:Gadget-Colortable.css

.colortable {
	text-align: center;
	
	--green-l:  #c8ffc8;
	--red-l: #ffc8c8;
	--blue-l: #c8c8ff;
	
	--green-d:  #4b804b;
	--red-d: #804b4b;
	--blue-d: #4b4b80;
	
	--green:  var(--green-l);
	--red: var(--red-l);
	--blue: var(--blue-l);
}

@media screen and (prefers-color-scheme: dark) {
	/* only timeless has a dark theme skin right now */
	/* citizen is not here because it manages dark theme itself; adding it here will conflict with its light theme */
	body.skin-timeless .colortable {
		--green: var(--green-d);
		--red: var(--red-d);
		--blue: var(--blue-d);
	}
}

html.skin-citizen-dark .colortable {
	--green: var(--green-d);
	--red: var(--red-d);
	--blue: var(--blue-d);
}

body.skin-citizen .colortable td {
	padding: 10px; /* default padding is 10px 20px 10px 0 but it looks weird with bg colors */
}

.ct-green  { background-color: var(--green)  }
.ct-red { background-color: var(--red) }
.ct-blue { background-color: var(--blue) }