@mixin smartphone
  @media only screen and (min-width: $smartphone)
    @content

@mixin smartphone-max
  @media only screen and (max-width: $smartphone)
    @content

@mixin tablet
  @media only screen and (min-width: $tablet)
    @content

@mixin tablet-max
  @media only screen and (max-width: $tablet)
    @content

@mixin laptop
  @media only screen and (min-width: $laptop)
    @content

@mixin laptop-max
  @media only screen and (max-width: $laptop)
    @content

@mixin desktop
  @media only screen and (min-width: $desktop)
    @content