@mixin r($media) {
    /* Landscape phones and down */
    @if $media == small {
        @media #{$small-up} { @content; }
    }
    @else if $media == small-only {
        @media #{$small-only} { @content; }
    }
    @else if $media == medium {
        @media #{$medium-up} { @content; }
    }
    @else if $media == medium-only {
        @media #{$medium-only} { @content; }
    }
    @else if $media == large {
        @media #{$large-up} { @content; }
    }
    /* Landscape phone to portrait tablet */
    @else if $media == xlarge {
        @media #{$xlarge-up} { @content; }
    }
    /* Portrait tablet to landscape */
    @else if $media == xxlarge {
        @media #{$xxlarge-up} { @content; }
    }

    @else if $media == retina {
        @media screen and (-webkit-min-device-pixel-ratio: 2) { @content; }
    }
}

@mixin respond($media...) {
    @each $mediatype in $media {
        @include r($mediatype) {@content}
    }
}