Work is still in progress to make our skins compatible with Roundcube 9. This upgrade is taking a bit longer than usual since we're re-creating the skins from scratch to make them even more complete and user-friendly. And we're introducing something completely new: skins for tablets! This means you'll be able to choose in your options what skin will be used for your desktop, phone and devices.
We're hoping to release the new skins soon! Keep yourself updated!