various minor adjustments

app/ui/style/olive-dark/style.css

@@ -18,6 +18,11 @@
 
 ***/
 
+/* Hack that forces checked QPushButtons to use dark color */
+QPushButton:checked {
+  background: #191919;
+}
+
 /* Node styling */
 NodeViewItemWidget {
   qproperty-titlebarColor: #4040a0;

app/ui/style/olive-light/palette.ini

@@ -14,4 +14,5 @@ Window=#D0D0D0
 WindowText=#000000
 
 [Disabled]
-ButtonText=#D0D0D0
+ButtonText=#808080
+Text=#808080

app/ui/style/olive-light/style.css

@@ -18,6 +18,9 @@
 
 ***/
 
+/* Hack that forces checked QPushButtons to use dark color */
+
+
 /* Node styling */
 NodeViewItemWidget {
   qproperty-titlebarColor: #a0a0ff;