.thumb{
    border:3px solid #fff;
    position:relative;
    float:left;
}

.thumb .thumb-info{
    opacity:0;
    width:100%; 
    height:100%; 
    position:absolute; 
    top:0;
    left:0;
    text-align:center;
    padding-top:25%;
    color:#fff;
}

.thumb .thumb-info:hover,.thumb .thumb-info:active{
    opacity:1;
    background:rgba(0,0,0,.7);
    transition: all .25s linear;
    text-decoration:none;
}

.thumb .lightbox_link{
    position:absolute;
    opacity:0;
}