title: Customise tabs of native base
body: <p>I need to customise tabs (change their background color ) from native base in my react native application, like shown in the image <a href="https://i.stack.imgur.com/en5uW.png" rel="noreferrer"><img src="https://i.stack.imgur.com/en5uW.png" alt="enter image description here"></a></p>
  
  <p>I've already tried this  <code>style={{  backgroundColor: '#C0C0C0' }}</code> but i keep getting the default theme. </p>