.thumbnail_img {
    position: relative;
    z-index: 0;
    /*right:420px;*/
}

.thumbnail_img:hover {
    background-color: transparent;
    z-index: 100;
}

.thumbnail_img span img { 
    display: inline-block;
    margin:-13px 17px 2px -13px;
}

.thumbnail_img span { 
    position: absolute;
    visibility: hidden;
    color: black;
    text-decoration: none;
    -webkit-transform:scale(0.8);
    -moz-transform:scale(0.8);
    -o-transform:scale(0.8);
    -webkit-transition-duration: 0.5s;
    -moz-transition-duration: 0.5s;
    -o-transition-duration: 0.5s;
    opacity: 0.7;
}

.thumbnail_img:hover span { /*CSS for enlarged image on hover*/
    visibility: visible;
    background: transparent;
    top: 0px;
    left:5px;
    -webkit-transform:scale(1.2);
    -moz-transform:scale(1.2);
    -o-transform:scale(1.2);
    opacity: 3;
    height:auto; width:auto;
    border:0;
}