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//http://theint.ro/blogs/outro/4686992-responsive-design-with-sass
@mixin respond-to($media) {
  @if $media == small {
    @media screen and (max-width: 420px) {
      @content
    }
  }
  @else if $media == medium {
    @media screen and (max-width: 768px) {
      @content
    }
  }
  @else if $media == large {
    @media screen and (min-width: 769px) {
      @content
    }
  }
}