如何将DIV2带到WRT DIV1的顶部？

Question

I am trying to bring DIV2 on top of DIV1,I have followed few of the earlier questions but nothing seems to have solved my problem .

Here are the corresponding DIV elemnts folowed by their CSS.

This is what am refering to DIV1

 <div class="left_black_out"><img alt=" close" src="./img/slider_in.png" style="background:none rgba(255,255,255,0.8); opacity:.3">
      <div class="world" >
        <h2>WORLD ABOVE THE WORLD</h2>
        <p>THIS IS IN TOP</p>
        </div>
    </div>

This is DIV2

<div class="disclaimer4" id="basic-modal-content">
  <h3>Disclaimer</h3>
  <p>Want this on TOP</p>
</div>

Corresponding CSS

.left_black_out {
    background:none rgba(0, 0, 0, 0.8);
    zoom:1;
    bottom: 0;
    display: block;
    height:100%;
    left: -660px;
    top:30px;
    padding: 100px 60px 30px;
    position: absolute;
    width: 800px;
    z-index: 9990;
    /*overflow:hidden;*/
    float: left;    
    margin-top:-30px;   
}

.disclaimer4 {
    position: absolute;
    opacity: .99
    z-index: 9999;
    overflow:hidden;
    float: left;    
}

If I change the position to "relative" the DIV1 vanishes completely. I have tried different values for z-index of DIV2 including negative values. Still am not able to bring it to top . How this can be achieved.

Answer 1

Your answer: fiddle link

.left_black_out {
background:none rgba(0, 0, 0, 0.8);
zoom:1;
bottom: 0;
display: block;
height:100%;
left: -660px;
top:30px;
padding: 100px 60px 30px;
position: absolute;
width: 800px;
z-index: -9990;
float: left;    
margin-top:-30px;   

}

change the z-index of .left_black_out in minus(-9990;)

z-index

Answer 2

try this one

.left_black_out {
    background:none rgba(0, 0, 0, 0.8);
    zoom:1;
    bottom: 0;
    display: block;
    height:100%;
    left: -660px;
    top:30px;
    padding: 100px 60px 30px;
    position: absolute;
    width: 800px;
    float: left;    
    margin-top:-30px; 
    z-index:0;
}

.disclaimer4 {
    position: absolute;
    overflow:hidden;
    float: left; 
    background:#fff;
    z-index:1;
    opacity:0.9;
}

http://jsfiddle.net/a3WSm/4/