body.v-fb_instant {
    background-color: #000 !important;
}

body.with-banner.v-fb_instant {
    justify-content: flex-end;
}
body.with-banner.v-fb_instant #GameDiv {
    margin: 0 auto !important;
    position: relative;
}

body.with-banner.v-fb_instant #GameArea {
    flex: 0 1 auto; /* don't grow, only shrink if needed */
    max-height: calc(100vh - var(--banner-h)); /* leave room for banner */
}


body:not(.with-banner).v-fb_instant #GameDiv {
    position: relative;
    height: 100%;
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
}