It looks like it won't be so simple for Steam. I just found out a couple of days ago that Steam only uses CEF to render the main content, and it actually looks

It looks like it won't be so simple for Steam. I just found out a couple of days ago that Steam only uses CEF to render the main content, and it actually looks like it's using GTK2 to render the window. See https://github.com/ValveSoftware/steam-for-linux/issues/4924#issuecomment-789324760 https://github.com/ValveSoftware/steam-for-linux/issues/4924....