div.thumbnails {
    margin: 0 auto;
    padding: 0 0 0 0;
}
.thumbnail {
    display:block; 
    float: left; 
    width:150px; 
    height:150px; 
    margin: 0.5em 0; 
    text-align:center;
    font-size: 60%;
    line-height: 1.2em;
    padding: 10px;
}

.thumbnail a {
    text-decoration: none;
}

.thumbnail img {
    border: 3px #444 solid;
}

.paginacion {
    clear: left;
    text-align: center;
}

.thumbnail img:hover {
    border: 3px #ffc solid;    
}