I need to set specific spacing value between Grid items in Material UI.
Bellow is the code I have:

```
<Grid container spacing={1}>
    <Grid item xs={6}>Node 1</Grid>
    <Grid item xs={6}>Node 2</Grid>
    ...etc
</Grid>

```

The problem is the margin when I set `spacing={1}` is a little bigger than what I want. How can I set custom value for margin between items?