title: Flutter rounded rectangle border with different colours for each side
body: <p>I'm trying to re-create a button I made with React Native that had different colours for each side giving it a kind of chiseled effect, a bit like Photoshop bevel and emboss, but also with rounded corners. At the moment I have a container outside the button which has the border on it, and inside I'm using <code>RawMaterialButton</code>. The code for the container is like this:</p>
  
  <pre><code>Container(
      BoxDecoration(
      border: Border(
      left: BorderSide(
      color: Colors.black,
      width: 1.0,
      ),
      top: BorderSide(
      color: Colors.black,
      width: 1.0,
       ),
      ),
     ),
    )
  </code></pre>
  
  <p>How can I make the corners for this border/container rounded? </p>
  
  <p>Like this but with rounded corners:</p>
  
  <p><a href="https://i.stack.imgur.com/9H0Ih.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/9H0Ih.png" alt="enter image description here"></a></p>