Make snackbar offset from view customisable

[iamhosseindhv]

Issue to fix problems of this nature: #57 #48

[JoeHetfield]

any work around about this? for set the offset to zero.

[iamhosseindhv]

This for sure will be added in future releases, however there're others feature/issues that take priority over this one.

[raymondsze]

Any release schedule? Would like to have the offset feature.

[duongdev]

Any option to auto set dense={true} on mobile and dense={false} on desktop? @iamhosseindhv

[iamhosseindhv]

No support from notistack. But of course it can be done wherever you're wrapping your app inside a SnackbarProvider @duongdev

[dhythm]

For someone's help, I just put a style like

const useStyles = makeStyles((theme) => ({
  // ...
  collapseWrapper: {
    marginTop: 4,
    marginBottom: 4,
  },
}))

to the props 'classes' of SnackProvider. (The default margin is 6px both)
Then, I could change the margin between the snackbars.

Before

After