title: Remove bottom border of tab group
body: <p>I want to remove the bottom border of the tabs group which in the image below is gray.</p>
  
  <p><a href="https://i.stack.imgur.com/rUkwW.png" rel="noreferrer"><img src="https://i.stack.imgur.com/rUkwW.png" alt="enter image description here"></a></p>
  
  <p>Here is a sample project to show of the code: </p>
  
  <p><a href="https://stackblitz.com/edit/angular-tabs-remove-bottom-border" rel="noreferrer">https://stackblitz.com/edit/angular-tabs-remove-bottom-border</a></p>