.thumb-tooltip {
    position: absolute;
    z-index: 3000;
    border: 1px solid rgba(0, 0, 0, .25);
    background: #fff url(example/loader.gif) no-repeat center padding-box;
    border-radius: 6px;
    box-shadow: 0 8px 16px -8px rgba(0, 0, 0, .25);
}

.thumb-tooltip-image {
    position: absolute;
    top: 5px;
    right: 5px;
    bottom: 5px;
    left: 5px;
    background-position: center;
    background-repeat: no-repeat;
    background-size: contain;
}