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위젯을 반투명하게 또는 안보이게 할 수 있는 위젯
flutter.dev Reference
Opacity class - widgets library - Dart API
A widget that makes its child partially transparent. This class paints its child into an intermediate buffer and then blends the child back into the scene partially transparent. For values of opacity other than 0.0 and 1.0, this class is relatively expensi
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