title: How do I make 2 color line below the AppBar?
body: <p>How do I make 2 color line below the AppBar?</p>
  
  <p>Like this below image showed!</p>
  
  <p><a href="https://i.stack.imgur.com/akce7.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/akce7.jpg" alt="enter image description here"></a></p>