.phones-only {
  display: none;

  @media @phones {
    display: inherit!important;
  }
}

.tablets-only {
  display: none;

  @media @tablets {
    display: inherit!important;
  }
}

.desktops-only {
  display: none;

  @media @desktops, @tvs {
    display: inherit!important;
  }
}