/* Create Grid */
.stack {
    /* set content as tall as the browser */
    min-height: 100vh;

    display: grid;

    /* Center elements */
    place-items: center;
    isolation: isolate;
}

/* Add all children into same container */
.stack > * {
    grid-column: 1 / -1;
    grid-row: 1 / -1;
}

/* target image & move behind everything */
.stack > .image {
    z-index: -1;
    width: 100%;
}