Panel < UIWidget
  phantom: true
  auto-focus: first

ScrollablePanel < UIScrollArea
  phantom: true
  auto-focus: first

FlatPanel < Panel
  background-color: #3f3f3f88
  border: 1 #000000

ScrollableFlatPanel < ScrollablePanel
  background-color: #3f3f3f88
  border: 1 #000000

LightFlatPanel < Panel
  background-color: #4f4f4faa
  border: 1 #000000
