@mixin logo($size: md, $size-md: none) {
  .#{$prefix}-logo {
    font-size: map_get($logo-sizes, $size);

    @if $size-md != none {
      @include respond-from(md) {
        font-size: map_get($logo-sizes, $size-md);
      }
    }

    @content;
  }
}