#cell1 {
    grid-column: 2/7;
    grid-row: 1/3
}

#cell2 {
    grid-column: 9 / 14;
    grid-row: 2 / 6
}

#cell3 {
    grid-column: 1/8;
    grid-row: 5/8;

}

#cell4 {
    grid-column: 2 / 9;
    grid-row: 9/11
}

#cell5 {
    grid-column: 10 / 16;
    grid-row: 7 / 11
}

#cell6 {
    grid-column: 1 / 16;
    grid-row: 15 / 16
}


@media (max-width: 800px) {
    #cell1 {
        grid-column: 3 / 14;
        grid-row: 1 / 2
    }

    #cell3 {
        grid-column: 1 / 16;
        grid-row: 3 / 4
    }

    #cell4 {
        grid-column: 1 / 10;
        grid-row: 7 / 8
    }

    #cell5 {
        grid-column: 11 /16;
        grid-row: 7 / 8
    }
    
    #cell6 {
        grid-column: 1 /16;
        grid-row: 9 / 10
    }

    #cell2 {
        grid-column: 1 / 16;
        grid-row: 13 / 14
    }
}