.image-gallery {
    display: block;
    float: left;
    height: auto;
    width: 90px;
    text-align: center; 
    margin: 3px;
    }

.image-gallery img {
    display: block;
    padding: 2px;
    border: 2px solid #c0c0c0;
    clear: both;
    }

.image-gallery span {
    text-align: center;
    }

.back {
    float: right;
    }