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@mixin for-phone-only {
  @media (max-width: 599px) { @content; }
}
@mixin for-tablet-portrait-up {
  @media (min-width: 600px) { @content; }
}
@mixin for-tablet-portait-only {
  @media (min-width: 600px) and (max-width: 899px) { @content; }
}
@mixin for-tablet-landscape-up {
  @media (min-width: 900px) { @content; }
}
@mixin for-tablet-landscape-only {
  @media (min-width: 900px) and (max-width: 1199px) { @content; }
}
@mixin for-desktop-up {
  @media (min-width: 1200px) { @content; }
}
@mixin for-desktop-only {
  @media (min-width: 1200px) and (max-width: 1799px) { @content; }
}
@mixin for-big-desktop-up {
  @media (min-width: 1800px) { @content; }
}

// usage
.my-box {
  padding: 10px;
  
  @include for-desktop-up {
    padding: 20px;
  }
}