2. Initialize a state variable for the animated property

To hide the text before the user clicks Show details, set
the starting value for opacity to zero:

{opacity2 → opacity3}/lib/main.dart

@@ -2,8 +2,6 @@

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// Use of this source code is governed by a BSD-style license

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// that can be found in the LICENSE file.

// ignore_for_file: missing_required_argument

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import 'package:flutter/material.dart';

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const owlUrl =

@@ -17,6 +15,8 @@

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