MdSnackBar do not show up in Safari iPhone 6s

[giona69]

Bug, feature request, or proposal:

MdSnackBar is not showing up on Safari / iOS 10.3.1 / iPhone 6s

apparently is hidden behind the bottom toolbar of safari

What is the expected behavior?

to show up normally

What is the current behavior?

it doesn't show up

What are the steps to reproduce?

just open a snackbar in any component

Which versions of Angular, Material, OS, TypeScript, browsers are affected?

angular ^4.1.0
starting from Material 2.0.0-beta.4
iOS 10.3.1
typescript ^2.3.2
safari
iPhone 6s

Is there anything else we should know?

no

[crisbeto]

This should've been fixed by #4664.

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