.thumb-wrapper {
    position: relative;
    display: inline-block;
}

.badge {
    position: absolute;
    top: 6px;
    left: 6px;
    background: rgba(255, 0, 0, 0.85);
    color: #fff;
    font-size: 25px;
    padding: 2px 6px;
    border-radius: 10px;
    font-weight: bold;
}