If you’re a Linux user who likes the look of the dark mode coming in macOS Mojave, you’re in luck: there’s a GTK theme just for you.
The theme is available on Gnome-Look.org alongside several other macOS inspired themes. You’re looking for the one titled McOS-MJV-Dark-mode, but feel free to download more if you think you might want to switch it up later.
Installing is a little tricky: you need to create a
.themes directory in your home folder, then extract the folder in the downloaded archive into that folder. Next you need to install Gnome Tweaks in the Ubuntu Software Store, which you can use to change the theme. You can also use Gnome Tweaks to move the buttons to the left side of the window, where they belong. Fight me.