@use "os" as *; @mixin WindowControl_Right() { @include OS($win) { @content; } @include OS($linux) { @media (-moz-gtk-csd-reversed-placement: 0) { @content; } } } @mixin WindowControl_Left() { @include OS($mac) { @content; } @include OS($linux) { @media (-moz-gtk-csd-reversed-placement) { @content; } } }