Useful responsive SCSS breakpoint mixins with IE8/IE7 fallback

gistfile1.txt

@import 'breakpoint';
$mobile: max-width 959px;
$desktop: min-width 960px;
@mixin break-mobile {
  @include breakpoint($mobile) {
    @content
  }
}
@mixin break-desktop {
  @include breakpoint($desktop) {
    @content
  }
  .lt-ie9 & {
    @content
  }
}
@mixin break-desktop-base {
  @include breakpoint($desktop) {
    @content
  }
}