Editor: Fixed outliner's low contrast issue in dark theme (#28248)

* hi con

* indent using  tabs

editor/css/main.css

@@ -661,10 +661,13 @@ select {
 		}
 
 	.Outliner {
-		color: #888;
 		background: #222;
 	}
 
+		.Outliner .option {
+			color: #999;
+		}
+
 		.Outliner .option:hover {
 			background-color: rgba(21,60,94,0.5);
 		}