/// Makes an element a outer container by centring it in the viewport, clearing its floats, and setting its `max-width`.
/// Although optional, using `outer-container` is recommended. The mixin can be called on more than one element per page, as long as they are not nested.
///
/// @param {Number (unit)} $local-max-width ($max-width)
///   Max width to be applied to the element. Can be a percentage or a measure.
///
/// @example scss - Usage
///   .element {
///     @include outer-container(100%);
///   }
///
/// @example css - CSS Output
///   .element {
///     *zoom: 1;
///     max-width: 100%;
///     margin-left: auto;
///     margin-right: auto;
///   }
///
///   .element:before, .element:after {
///     content: " ";
///     display: table;
///   }
///
///   .element:after {
///     clear: both;
///   }

@mixin outer-container($local-max-width: $max-width) {
  @include clearfix;
  max-width: $local-max-width;
  margin: {
    left: auto;
    right: auto;
  }
}