Ubuntu 15.10 Built-in hidden scroll bar

Ubuntu 15.10 (Willy's Werewolf) operating system A major feature is the use of scroll bars from the upstream gnome, which will make many users happy. Ubuntu developer Canonical is a company that doesn't rely too much on upstream projects and why we're still using unity 7 today, but that doesn't mean canonical doesn't rely on GNOME at all, in fact, Ubuntu developers still rely heavily on GNOME.
in Ubuntu 15.10 (Willy's Werewolf) operating system, canonical is receptive, giving up the scroll bars that are always displayed in previous versions of Ubuntu, instead using a scroll bar design from GNOME, which remains hidden when the user does not need to scroll. , which is displayed when the user needs it, even though the new scroll bar is still slimmer than the GNOME version.
for this, Ubuntu developer Marco's Trevisan explains that the width of the scrollbar in the normal display state is 10 pixels, which becomes 8 pixels when the user pulls or slides.
released today Ubuntu 15.10 Wily Werewolf Beta 2, the final version will be released on October 22. The beta version includes not only images of Ubuntu Desktop, Server, Cloud, and Core products, but also Kubuntu, Lubuntu, Ubuntu GNOME, Ubuntu MATE, Ubuntu K Ylin, Ubuntu Studio, and xubuntu flavours.
This release mainly fixes a major bug that affects all flavour:
1) Depending on your location, Ubiquity may trigger a ubi-timezone
Error during install. If you encounter this, the recommended
Work-around is to install without an active network connection.
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Ubuntu 15.10 Built-in hidden scroll bar