night.css: lower brightness of unchecked checkboxes

themes/night.css

@@ -1983,6 +1983,9 @@ body.flat.ttrss_main #content-insert .post .header {
   background: #222222;
   border-color: #222222;
 }
+body.flat.ttrss_main .dijitCheckBox:not(.dijitChecked)::before {
+  color: #999999;
+}
 body.flat.ttrss_main .insensitive {
   color: #999999;
 }

themes/night.less

@@ -119,6 +119,10 @@ body.flat.ttrss_main {
 		}
 	}
 
+	.dijitCheckBox:not(.dijitChecked)::before {
+		color : @fg-insensitive;
+	}
+
 	.insensitive {
 		color : @fg-insensitive;
 	}