body {
  padding-top: 50px;
}
 
.thumbnail {
    position:relative;
    overflow:hidden;
}
 
.caption {
    position:absolute;
    top:0;
    right:0;
    background:rgba(66, 139, 202, 0.75);
    width:100%;
    height:100%;
    padding:2%;
    display: none;
    text-align:center;
    color:#fff !important;
    z-index:2;
}