#cell1 {
    grid-column: 2/15;
    grid-row: 1/2
}

#cell2 {
    grid-column: 1/6;
    grid-row: 7/8
}

#cell3 {
    grid-column: 8 / 16;
    grid-row: 6 / 10
}

#cell4 {
    grid-column: 2 / 7;
    grid-row: 9/13
}

#cell5 {
    grid-column: 9 / 14;
    grid-row: 11 / 12
}


@media (max-width: 800px) {
    #cell1 {
        grid-column: 1 / 16;
        grid-row: 1 / 2
    }

    #cell2 {
        grid-column: 1 / 5;
        grid-row: 3 / 4
    }

    #cell3 {
        grid-column: 6 / 16;
        grid-row: 3 / 7
    }

    #cell4 {
        grid-column: 1 / 5;
        grid-row: 4 / 7
    }
    
    #cell5 {
        grid-column: 1 /16;
        grid-row: 8 / 9
    }
}