.thum {
    position: relative; /* important for absolute child */
}

.service-badge {
    position: absolute;
    top: 10px;
    left: 10px;
    background: #767474;       /* red background or any color */
    color: #fff;
    padding: 8px 16px;
    font-weight: bold;
    font-size: 14px;
    border-radius: 4px;         /* or 50% for circular badge */
    z-index: 2;
}