a simple approach to solve this issue is to create another Grid
container inside the main parent Grid container. Then inside that new container put those two icons as grid items.
{/* <!-- here --> */}
<Grid item style={{ alignSelf: "center" }}>
<Grid container direction="column">
<Grid item>
<ButtonBase className={classes.image}>
<ArrowUpward />
</ButtonBase>
</Grid>
<Grid item>
<ButtonBase className={classes.image}>
<ArrowDownward />
</ButtonBase>
</Grid>
</Grid>
</Grid>
{/* <!-- end--> */}
Here is a working demo:
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