.image-hotspot-container {
    position: relative;
    background-size: cover;
    background-position: center;
    width: 100%;
    height: 500px;
}

.hotspot {
    position: absolute;
    width: 20px;
    height: 20px;
    background-color: red;
    border-radius: 50%;
    cursor: pointer;
}

.hotspot:hover::after {
    content: attr(data-content);
    position: absolute;
    top: -30px;
    left: 20px;
    background: #333;
    color: #fff;
    padding: 5px 10px;
    border-radius: 5px;
    white-space: nowrap;
}