Hover grid pop out

by Louis Walch

HTML

<div id="wrapper">
    <div><a href="#"></a></div>
    <div><a href="#"></a></div>
    <div><a href="#"></a></div>
    <div><a href="#"></a></div>
    <div><a href="#"></a></div>
    <div><a href="#"></a></div>    
</div>

CSS

BODY,HTML {
    width: 100%;
    height: 100%;
}

#wrapper {
    background-color: red;
    width: 100%;
    height: 100%;
}
#wrapper DIV {
    background-color: blue;
    height: 50%;
    width: 33.3%;
    float: left;  
    position: relative;
}
#wrapper DIV A {
    display: block;
    background-color: #ccc;
    z-index: 1;
    position: absolute;
    top: 0; 
    bottom: 0;
    left: 0;
    right: 0;
}
#wrapper DIV A:hover {
    background-color: #666;
    top: -20px; 
    bottom: -20px;
    left: -20px;
    right: -20px;
    z-index: 2;
}