Renato De Donato
a new hope
`paper-dialog-scrollable` implements a scrolling area used in a Material Design dialog. Use this
together with elements implementing `paper-dialog-behavior`.
It shows a top divider after scrolling if it is not the first child in its parent container. It
shows a bottom divider if it is scrollable and it is not the last child in its parent container.
The bottom divider is hidden if it is scrolled to the bottom.