title: Scrollbar not displayed flutter web
body: <p>Scrollbar not displayed in flutter web.
   my second try is:</p>
  
  <pre><code>Widget getSecondStep() {
          return  DraggableScrollbar.arrows(
            controller: ScrollController(),
            child: ListView(
                shrinkWrap: true,
                children: &lt;Widget&gt;[
                  Row(
                    mainAxisSize: MainAxisSize.min,
                    mainAxisAlignment: MainAxisAlignment.center,
                    crossAxisAlignment: CrossAxisAlignment.center,
                    children: &lt;Widget&gt;[BlaBlaBla(), BlaBla()],
                  ),
                ],
              ),
          );
        }
  </code></pre>
  
  <p>and my first try was:</p>
  
  <pre><code>Widget getSecondStep() {
          return  Scrollbar(
            controller: ScrollController(),
            child: ListView(
                shrinkWrap: true,
                children: &lt;Widget&gt;[
                  Row(
                    mainAxisSize: MainAxisSize.min,
                    mainAxisAlignment: MainAxisAlignment.center,
                    crossAxisAlignment: CrossAxisAlignment.center,
                    children: &lt;Widget&gt;[BlaBlaBla(), BlaBla()],
                  ),
                ],
              ),
          );
        }
  </code></pre>
  
  <p>i'm trying to change theme color but it didn't work.</p>
  
  <p>finally, <code>flutter doctor -v</code></p>
  
  <pre><code> [√] Flutter (Channel beta, v1.14.6, on Microsoft Windows [Version
   10.0.18362.657], locale en-US)
       • Flutter version 1.14.6 at C:\flutter_windows_v1.9.1+hotfix.2-stable\flutter
       • Framework revision fabeb2a16f (4 weeks ago), 2020-01-28 07:56:51 -0800
       • Engine revision c4229bfbba
       • Dart version 2.8.0 (build 2.8.0-dev.5.0 fc3af737c7)
  
  
   [√] Android toolchain - develop for Android devices (Android SDK
   version 29.0.2)
       • Android SDK at C:\Users\moshi\AppData\Local\Android\sdk
       • Android NDK location not configured (optional; useful for native profiling support)
       • Platform android-29, build-tools 29.0.2
       • Java binary at: C:\Program Files\Android\Android Studio\jre\bin\java
       • Java version OpenJDK Runtime Environment (build 1.8.0_202-release-1483-b03)
       • All Android licenses accepted.
  
   [√] Chrome - develop for the web
       • Chrome at C:\Program Files (x86)\Google\Chrome\Application\chrome.exe
  
   [√] Android Studio (version 3.5)
       • Android Studio at C:\Program Files\Android\Android Studio
       • Flutter plugin version 40.0.2
       • Dart plugin version 191.8423
       • Java version OpenJDK Runtime Environment (build 1.8.0_202-release-1483-b03)
  
   [!] VS Code (version 1.42.1)
       • VS Code at C:\Users\moshi\AppData\Local\Programs\Microsoft VS Code
       X Flutter extension not installed; install from
         https://marketplace.visualstudio.com/items?itemName=Dart-Code.flutter
  
   [√] Connected device (2 available)
       • Chrome     • chrome     • web-javascript • Google Chrome 79.0.3945.130
       • Web Server • web-server • web-javascript • Flutter Tools
  
   ! Doctor found issues in 1 category.
  </code></pre>