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Foundation 6 Reveal Modal full not full screen in Safari

I use buttons that open full screen modals, but in Safari and some Chrome versions (mobile only) it is not full screen and tab elements that should be hidden (behind) are visible and it is bad UX

tabsmodalrevealfullFoundationmobile

I use buttons that open full screen modals, but in Safari and some Chrome versions (mobile only) it is not full screen and tab elements that should be hidden (behind) are visible and it is bad UX