Added checked style for tool buttons

images/style-mission.css

@@ -133,6 +133,10 @@ QToolButton {
 	background-color: qlineargradient(x1: 0, y1: 0, x2: 0, y2: 1, stop: 0 #303030, stop: 1 #202020);
 }
 
+QToolButton:checked {
+	background-color: qlineargradient(x1: 0, y1: 0, x2: 0, y2: 1, stop: 0 #090909, stop: 1 #353535);
+}
+
 QToolButton:pressed {
 	background-color: qlineargradient(x1: 0, y1: 0, x2: 0, y2: 1, stop: 0 #bbbbbb, stop: 1 #b0b0b0);
 }