///
/// Box sizing
///
/// @access private
///
/// @param {String} $type ["border-box"] - border-box type
///
/// @requires {Mixin} box-sizing - local mixin if available
///
/// @group Internal Mixins
///
@mixin flint-box-sizing($type: "border-box") {
    @if mixin-exists("box-sizing") {
        @include box-sizing($type);
    } @else {
        box-sizing: #{$type};
    }
}