Can someone help me troubleshoot why justify is not working in this code block?
<Grid container direction='column' alignItems='center' justify='center' spacing='1'>
<Grid item xs={12}>
<Typography variant='h1'>First Item</Typography>
</Grid>
<Grid item xs={12}>
<Typography variant='h4'>First Item</Typography>
</Grid>
<Grid item xs={12}>
<Typography variant='h6'>First Item</Typography>
</Grid>
</Grid>