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Floating action button
A round button anchored to a corner that hovers above content.
A FAB is a round button that hovers above the content, usually at the bottom-right. It represents the single most important action on the screen — Compose new email, New message, Add item.
One FAB per screen, max. Multiple FABs make none of them special. Keep the icon obvious and pair it with a label on first use so users learn what it does.