title: CSS rectangle button on it and text inside it
body: <p>I need to create this type of shape, the green part is a button.
  This design is for smartphone only and the rectangle must cover whole width of screen.</p>
  
  <p><a href="https://i.stack.imgur.com/NVBYQ.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/NVBYQ.jpg" alt="enter image description here"></a></p>