Floating div css animate

Attempting to animate the layout change for floated divs

HTML

<div id="content">
    
    <div>&nbsp;</div>
    <div>&nbsp;</div>
    <div>&nbsp;</div>
    <div>&nbsp;</div>
    <div>&nbsp;</div>
    
</div>

CSS

body {
    background-color: #333;
}

#content div {
    position: relative;
    float: left;
    background-color: #eee;
    margin-left: 10px;
    margin-bottom: 10px;
    width: 100px;
    height: 100px;
    
    -webkit-transition: all .2s ease;
    -moz-transition: all .2s ease;
    -ms-transition: all .2s ease;
    -o-transition: all .2s ease;
    transition: all .2s ease;
}

#content {
    margin-top: 50px;
    padding-top: $gutter;
    padding-bottom: 50px;
    overflow: hidden;
    width: 100%;
}