CSS3 Flip Animations

HTML

<div id="f1_container">
    <div id="f1_card" class="shadow">
        <div class="front face">
            <img src="http://www.fpoimg.com/450x281"/>
        </div>
        <div class="back face center">
            <p>This is nice for exposing more information about an image.</p>
            <p>Any content can go here.</p>
        </div>
         </div>
</div>

CSS

#f1_container {
    position: relative;
    margin: 10px auto;
    width: 450px;
    height: 281px;
    z-index: 1;
}
.face.back {
    display: none;
}

#f1_container {
    perspective: 1000;                
}
#f1_card {
    width: 100%;
    height: 100%;    
    transform-style: preserve-3d;
    transition: all 1.0s linear;    
}
#f1_container:hover #f1_card {
    transform: rotateY(180deg);
    box-shadow: -5px 5px 5px #aaa;
}
.face {
    position: absolute;
    width: 100%;
    height: 100%;
    backface-visibility: hidden;
}
.face.back {
    display: block;
    transform: rotateY(180deg);
    box-sizing: border-box;
    padding: 10px;
    color: white;
    text-align: center;
    background-color: #aaa;
}