How do I add a top and bottom shadow while scrolling but only when needed?

Question

How do I add a shadow when a container overflows but only when needed?

What I mean by this is:

• if there is content available to scroll

Answer 1

I think your looking for something like this;

Reference : LINK

html {
  background: white;
  font: 120% sans-serif;
}

.scrollbox {
  overflow: auto;
  width: 200px;
  max-height: 200px;
  margin: 50px auto;
  background: /* Shadow covers */
  linear-gradient(white 30%, rgba(255, 255, 255, 0)), linear-gradient(rgba(255, 255, 255, 0), white 70%) 0 100%, /* Shadows */
  radial-gradient(50% 0, farthest-side, rgba(0, 0, 0, .2), rgba(0, 0, 0, 0)), radial-gradient(50% 100%, farthest-side, rgba(0, 0, 0, .2), rgba(0, 0, 0, 0)) 0 100%;
  background: /* Shadow covers */
  linear-gradient(white 30%, rgba(255, 255, 255, 0)), linear-gradient(rgba(255, 255, 255, 0), white 70%) 0 100%, /* Shadows */
  radial-gradient(farthest-side at 50% 0, rgba(0, 0, 0, .2), rgba(0, 0, 0, 0)), radial-gradient(farthest-side at 50% 100%, rgba(0, 0, 0, .2), rgba(0, 0, 0, 0)) 0 100%;
  background-repeat: no-repeat;
  background-color: white;
  background-size: 100% 40px, 100% 40px, 100% 14px, 100% 14px;
  /* Opera doesn't support this in the shorthand */
  background-attachment: local, local, scroll, scroll;
}

  

    
I Show Below Shadow. Go Down Now
    
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The end!
    
No shadow here. See Above. Go Up