Steam skin which tries to look like a native app for elementary OS and macOS.
Windows is not supported now
This skin is not completely ready. There are many bugs. Only some basic windows and pages are (not completely) done. It may work on Windows but it's not optimized for Windows at all and not tested.
Download latest skin version.
eOSfolder into Steam skins directory:
Windows:not supported now
Open Steam Settings > Interface, select eOS skin and restart Steam