Name media queries

gistfile1.sass

@mixin at-least($device-width, $old-ie: "false") {
  @media screen and (min-width: $device-width) {
    @content;
  }
 
  @if $old-ie == "true" {
    .lt-ie9 & {
      @content;
    }
  }
}
 
@mixin until($device-width, $old-ie: "false") {
  @media screen and (max-width: $device-width) {
    @content;
  }
 
  @if $old-ie == "true" {
    .lt-ie9 & {
      @content;
    }
  }
}