Css Z-index Not Working With Relative Positioning

I have some divs like so:

Solution 1:

You have to use top and left attributes. Look at this solution https://jsfiddle.net/f5L4puaa/

<div id="out">
    <div id="in">
    <div id="one" style="position: relative; z-index: 3; background-color:orange; top: 3.5em;">div one
    </div>
    <div id="two" style="position: relative; z-index: 2;  background-color: yellow; top:3em;">div two
    </div>
    <canvas id="three" style="position: relative; z-index: 1;  background-color:pink;">div three
    </canvas>
    <canvas id="four" class="hidden">
    </canvas>
    </div>
</div>

Solution 2:

Here's a working example using "absolute" positioning: https://jsfiddle.net/x32m5rhv/1

<div><divid="myBox"style="border: 1px solid #000; width: 100px; height: 100px; z-index: 4; position: absolute; background-color: #ff0000; opacity:0.8">myBox z-index 4</div><divstyle="width:100px;height:100px;position:absolute;background-color:yellow;top:20px;left:20px;z-index:0;opacity:0.5;border:1px solid #333333;">z-index 0</div><divstyle="width:100px;height:100px;position:absolute;background-color:yellow;top:40px;left:40px;z-index:1;opacity:0.5;border:1px solid #333333;">z-index 1</div><divstyle="width:100px;height:100px;position:absolute;background-color:yellow;top:60px;left:60px;z-index:2;opacity:0.5;border:1px solid #333333;">z-index 2</div><divstyle="width:100px;height:100px;position:absolute;background-color:yellow;top:80px;left:80px;z-index:3;opacity:0.5;border:1px solid #333333;">z-index 3</div></div>

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