Get Horizontal OSD for Brightness & Volume Changes on Linux Mint
The “Horizontal OSD” extension for Linux Mint (yes, Linux Mint has extensions too) reformats Cinnamon’s default volume and screen brightness indicators from a vertical box to a horizontal bar. It’s a subtle tweak that I think gives the Cinnamon desktop an extra splash of modernity (GNOME Shell switched its OSD from boxes to bars last year).
While the look of the horizontal OSD blends in perfectly with the rest of the Linux Mint’s default look (meaning out of the box it looks totally native) you do get ample controls to adjust the appearance.