title: Sierra Notification Center widgets background colour
body: <p>Notification Center in Sierra has a new, light background colour compared with Yosemite and El Cap. My widget, however, still shows the old, dark style, even when I rebuild with the new SDK.</p>
  
  <p>The view has appearance set to "Inherited (Vibrant Dark)". Changing that to "Aqua" seems to have no effect.</p>
  
  <p>Is it possible to change third party widgets to look the same as Apple's? I notice all the other third party widgets I look the same.</p>