message: FixedLayout: removed .FixedLayout_in; fixed bug with double padding on iOS 11. Tabs: fixed bug with transparent area when Tabs was inside FixedLayout.
diff: .FixedLayout--bottom {
  width: 100%;
  bottom: 0;
  - }
  -
  - .FixedLayout--ios.FixedLayout--bottom .FixedLayout__in {
  padding-bottom: constant(safe-area-inset-bottom);
  padding-bottom: env(safe-area-inset-bottom);
  }
  