The color that appears at the top and bottom of the mobile site is configurable under the "Settings" tab of the editor. Here you can also opt to disable the mobile site from showing altogether. In this case, your mobile visitors would still be shown the regular website.
We hope you enjoy these new features! As always, we'd love to hear your feedback in the comments and greatly appreciate your support. We have a number of other cool features to announce soon, so make sure to keep on eye on our blog!