title: inset box-shadow - same sides and bottom, top without visible shadow
body: <p>How to make such a box-shadow?:
  <a href="https://i.stack.imgur.com/cJkf0.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/cJkf0.png" alt="enter image description here"></a></p>
  
  <p>Sides and bottom is same, top is 1px <code>border</code>, without visible shadow.</p>