.zalo-custom-icon-overlay {
    position: fixed;
    z-index: 2147483647 !important;
    right: 20px;
    bottom: 18px;
    display: grid;
    width: 60px;
    height: 60px;
    place-items: center;
    border-radius: 50%;
    background: transparent;
    box-shadow: 0 12px 28px rgba(2, 68, 48, .34);
    pointer-events: none;
    transition: transform .18s ease;
}

.zalo-custom-icon-overlay img {
    display: block;
    width: 100%;
    height: 100%;
    border-radius: inherit;
    object-fit: contain;
}