How do you do a nested grid

[adamjw3]

trafficstars

  <Grid columns={"1"} justifyContent="center" rowGap="40px">
        <Cell>
            <Grid columns="5">
<Cell></Cell>
<Cell></Cell>
<Cell></Cell>
<Cell></Cell>
<Cell></Cell>
           </Grid>
</Cell>
<Cell></Cell>
.....
</Grid>

The 5 columsn nested doesn't work

[murffious]

Nested Grid also not working for me in Firefox only

<Grid columns={6}>
            <Cell width={3}>
                   <Grid columns="repeat(3, 280px)" >
                     // doing a map over some cells 
                          <Cell ><Cell />
                       </Grid >
             </Cell>
  <Cell width={2}>
 </Cell>
            <Cell width={1}>
 </Cell>
                      </Grid >