Components - Buttons(Floating Action Button)

출처 : http://www.google.com/design/spec/components/buttons-floating-action-button.html

The floating action button should be placed 16dp minimum from the edge on mobile and 24dp minimum on tablet/desktop.

Floating action button

Interior icon: 24 x 24dp
Floating action button circle: 56 x 56dp

Mini floating action button

Interior icon: 24 x 24dp
Floating action button circle: 40 x 40dp