title: How to change the background color of Popup MenuButton bullet window?
body: <p>I want to change the background color of Popup Menu Button window. What should I do? I hope I can get your help. Thank you.When I change the color of container, some corners cannot change the color.</p>
  
  <pre><code> new IconButton(
              icon: new Icon(
                Icons.search,
                color: Colors.white,
              ),
              onPressed: () {},
            ),
            new PopupMenuButton(
              offset: const Offset(0.0, 60.0),
              icon: new Icon(Icons.add, color: Colors.white),
              itemBuilder: (BuildContext context) =&gt; &lt;PopupMenuItem&lt;String&gt;&gt;[
                    new PopupMenuItem&lt;String&gt;(
                        value: '选项一的值',
                        child: new Container(
                            color: Colors.red,
                            child: new Column(
                              children: &lt;Widget&gt;[
                                new Row(
                                  children: &lt;Widget&gt;[
                                    new Image.asset(defaultAvatar,
                                        width: 30.0, height: 30.0),
                                    new Text('发起群聊')
                                  ],
                                ),
                              ],
                            ))),
                    new PopupMenuItem&lt;String&gt;(
                        value: '选项一的值',
                        child: new Container(
                            child: new Column(
                          children: &lt;Widget&gt;[
                            new Row(
                              children: &lt;Widget&gt;[
                                new Image.asset(defaultAvatar,
                                    width: 30.0, height: 30.0),
                                new Text('添加朋友')
                              ],
                            ),
                          ],
                        ))),
  </code></pre>
  
  <p><a href="https://i.stack.imgur.com/rqQrc.png" rel="noreferrer"><img src="https://i.stack.imgur.com/rqQrc.png" alt="enter image description here"></a></p>