Question

I have a div with absolute position on a page which overlaps on another div when scrolling. I want to make it invisible when it scrolls to a specific div.

For that purpose, I’m using the z-index. I’m setting the z-index 1 of the div which I want to hide, and much higher z-index for the other div. However it does not hide the div. If I set the z-index to -1 then it hides but then the links on that div are no more clickable. How can I fix this?

.wrap {
  width: 300px;
  position: relative;
  overflow: hidden;
  border: 1px solid #000;
}

.up {
  height: 100px;
}

.box {
  position: absolute;
  top: 20px;
  background: yellow;
  width: 100px;
  height: 100px;
  z-index: -1;
}

.down {
  background: green;
  overflow: hidden;
  z-index: 200;
  height: 400px;
}

<div class="wrap">
  <div class="up">
    <div class="box"><a href="#">Should hide</a></div>
  </div>
  <div class="down">Should be visible</div>
</div>

So the problem in above example is that the links in the .box are not clickable (because of -ve z-index value), and if I set it positive, it wont hide behind the .down.

JSFiddle:
http://jsfiddle.net/G2xRA/

Answer 1

Actually z-index only works with position so I gave the position:relative; to your .down class.

See the mentioned below CSS & DEMO.

.box{
        position: absolute;
        top: 20px;
        background: yellow;
        width: 100px;
        height: 100px;
        z-index: 1;  
    }

    .down {
        background: none repeat scroll 0 0 green;
        height: 400px;
        overflow: hidden;
        position: relative;
        z-index: 2;
    }

DEMO