title: Flutter opacity on image within container
body: <p>I couldn't find a way to make this image within a container opaque.</p>
  
  <pre><code>Container(
        margin: EdgeInsets.symmetric(
            vertical: 12, horizontal: 8),
        decoration: BoxDecoration(
          color: Colors.white,
          borderRadius: BorderRadius.circular(40),
          image: DecorationImage(
              image: AssetImage("images/img.png"),
              fit: BoxFit.scaleDown),
        ),
        child: SomeWidget(),
      )
  </code></pre>