.thumbnail {
    position:relative;
    overflow:hidden;
}
 
.caption {
    position:absolute;
    top:0;
    right:0;
    background:rgba(255, 499, 499, 0.75);
    width:100%;
    height:100%;
    padding:2%;
    display: none;
    text-align:center;
    color:#AB0C0C !important;
    z-index:2;
}