title: SingleChildScrollView is not Scrollable
body: <p>I am trying to add SingleChildScrollView for the page but it appears to be not working, can't figure the reason. I am not getting any overflow errors as such but the Fitbutton is not visible on the screen. I tried searching on the net but didn't find any relevant solution.
  This is the code snippet I tried:</p>
  <pre><code>return Scaffold(
          body:SingleChildScrollView(
            child: Form(
                  key:_formKey,
                  child: Padding(
                    padding: const EdgeInsets.all(0.0),
                    child: Stack(
                      children: &lt;Widget&gt;[
                        Container(
                            decoration:( ...
                             ),
                            )
                        ),
                        Positioned(
                            
                            top: MediaQuery.of(context).size.width * 0.10,
                            child: Container(
                              margin: EdgeInsets.all(13.0),
                              child:Column(
                                  mainAxisAlignment: MainAxisAlignment.center,
                                  children: &lt;Widget&gt;[
                                    Text(&quot;Welcome&quot;,style: TextStyle(fontWeight: FontWeight.bold,fontSize: 25.0),),
                                    SizedBox(
                                      height: 22,
                                    ),
                                    Stack(
                                      alignment: Alignment.centerLeft,
                                      children: [
                                        Container(
                                          height:60.0,
                                          padding: EdgeInsets.only(left: 53.0),
                                          child: buildNameField()
                                        ),
                                        CircleAvatar(
                                          ...
                                        ),
                                      ],
                                    ),
                                    SizedBox(
                                      height: 22.0,
                                    ),
                                    Stack(
                                      alignment: Alignment.centerLeft,
                                      children: [
                                        .....
                                      ],
                                    ),
                                    SizedBox(
                                      height: 10,
                                    ),
                                    Stack(
                                      alignment: Alignment.centerLeft,
                                      children: [
                                        ...
                                      ],
                                    ),
                                    
                                    SizedBox(height: 22),
                                    FitButton(
                                      ....
                                    ),
                                    Padding(
                                      padding: const EdgeInsets.only(top: 16),
                                      child: _buildSignInButton(),
                                    ),
                                  ]
                              ),
                            ),
                        ),],
                    ),
                  ),
                ),),
       );
  </code></pre>
  <p>Any help would be great !!</p>