.how_to_buy .sticky-image-wrapper {
    position: -webkit-sticky;
    position: sticky;
    top: 100px;
    z-index: 10;
}

@media (max-width: 767px) {
    .how_to_buy .sticky-image-wrapper {
        position: relative;
        top: 0;
        margin-top: 20px !important;
    }
}