title: Flutter how to give triangle shape to container?
body: <p>I have a simple container with border radius</p>
  <p>like this</p>
  <pre><code>            Container(
                  width: double.infinity,
                  height: 500,
                  decoration: BoxDecoration(
                      color: Colors.white,
                      borderRadius: BorderRadius.only(topLeft: Radius.circular(30), bottomLeft: Radius.circular(30), bottomRight: Radius.circular(30),),
                      boxShadow: [
                        BoxShadow(
                            blurRadius: 7,
                            color: Color(0xffecedf1),
                            spreadRadius: 4)
                      ])),
  </code></pre>
  <p>Its square type shape i want to give a triangle one side shape like this</p>
  <p><a href="https://i.stack.imgur.com/K1MYM.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/K1MYM.png" alt="enter image description here" /></a></p>
  <p>Need to know how can i achieve this type of container ?</p>