$window-medium: 768px;
$window-large: 992px;
$window-xlarge: 1200px;

@mixin medium {
  @media (min-width: #{$window-medium}) {
    @content;
  }
}

@mixin large {
  @media (min-width: #{$window-large}) {
    @content;
  }
}

@mixin xlarge {
  @media (min-width: #{$window-xlarge}) {
    @content;
  }
}