z-indexing floating divs

css z-index css-float
Preston picture Preston · Feb 16, 2011 · Viewed 10.5k times · Source

I have two divs float:left. I z-index the first div to be above, but it doesn't work. Is this because floated elements are not positioned?

<html>

<style>
    #wrap{
        background:#666;
    }

    #menu, #thumbs{
        float:left;
    }

    #menu{
        background:#06C;
        z-index:10;
    }
    #thumbs{
        background:#0CF;
        margin-left:-20px;
    }

</style>
</head>

<body>

<div id="wrap">
    <div id="menu">
    <p>menu</p>
    </div>
    <div id="thumbs">
    <p>thumbs</p>
    </div>
</div>


</body>
</html>

Answer

anothershrubery picture anothershrubery · Feb 16, 2011

You need to set the position property. Adding position:relative to #menu displays the menu div above thumbs.

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