title: How to get shadow on a floating button in react native
body: <p><strong>What I am trying to achieve</strong>: A floating rounded button with plus symbol, with blue background, and blue shadow.</p>
  
  <p><strong>What I have tried</strong>: I am able to get a rounded floating button with plus symbol</p>
  
  <p><strong>What I am not able to attain</strong>: Shadow for it with blue color</p>
  
  <hr>
  
  <p><strong>Code:</strong></p>
  
  <pre><code>&lt;View style={historyStyles.AvatarView}&gt;
            &lt;Avatar
              size={"medium"}
              rounded
              icon={{ name: "plus", type: "font-awesome" }}
              overlayContainerStyle={{
                backgroundColor: this.props.theameColors.PRIMARY
              }}
              onPress={this.gotoFeed}
              activeOpacity={0.7}
            /&gt;
          &lt;/View&gt;
  </code></pre>
  
  <p><strong>With above code I got the result:</strong> (I am not able to get shadow)</p>
  
  <p><a href="https://i.stack.imgur.com/8D2kO.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/8D2kO.jpg" alt="enter image description here"></a></p>
  
  <p><strong><em>Note:</em></strong> I can't use third party library</p>