Figure Function

HTML

<div id="gallery">
<figure>
    <img src="http://static.fanpage.it/techfanpage/wp-content/uploads/2012/10/eros-ramazzotti-il-5-novembre-live-su-google-e-youtube-416x277.jpg" width="200" height="150">
    <figcaption>figura 2 1</figcaption><!---quello che ho inserito--->
    </figure>
<figure>
    <img src="http://cdn.blogosfere.it/hightech/images/google.jpg" width="200" heigth="150">
    <figcaption>figura 1</figcaption><!---quello che ho inserito--->
</figure>
</div>

CSS

#gallery {
    width: 100%;
    max-width: 410px;
    margin: 10px auto;
    font: 85% verdana;
    overflow: hidden;
}
#gallery figure {
    float: left;
    width: 200px;
    height: 150px;
    position: relative;
    margin: 0 5px 0 0;
}
#gallery figure img {
    display: block;
    width: 100%;
    height: 100%;
}
#gallery figure:after {
    content: '+';
    position: absolute;
    bottom: 5px;
    left: 5px;
    width: 24px;
    height: 24px;
    line-height: 24px;
    text-align: center;
    background: rgba(0, 0, 0, 0.7);
    color: #fff;
}
#gallery figcaption {
    position: absolute;
    bottom: 0;
    padding: 10px 0;
    text-align: center;
    width: 100%;
    left: 0;
    z-index: 10;
    color: #fff;
    background: #aaa;
    opacity: 0;
    cursor: pointer;
    -moz-transition: all 500ms ease-in;
    -webkit-transition: all 500ms ease-in;
    -o-transition: all 500ms ease-in;
    -ms-transition: all 500ms ease-in;
        transition: all 500ms ease-in;
}

#gallery figcaption:hover {
    opacity: 1;
}