.aspect-wrapper {
    position: absolute;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    overflow: hidden;
}

.aspect-wrapper > video,
.aspect-wrapper > img {
    max-width: 100%;
    max-height: 100%;
    object-fit: contain;  /* keep 1050x1750 ratio */
}

#thirdVideo-container {
    visibility: hidden; !* Initially hide the content *!
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    position: absolute;
    width: 100%;
    height: 100%;
    top: 0;
    left: 0;
    overflow: hidden;
    text-align: center;
    z-index: 0;
}

#mainCard-container {
    z-index: 1; !* middle (PNG mask with window) *!
}
#splash-container {
    z-index: 5; /* top (card video seen through PNG window) */
}