foundation-sites/scss/prototype/_overflow.scss

// Foundation for Sites by ZURB
// foundation.zurb.com
// Licensed under MIT Open Source

////
/// @group prototype-overflow
////

/// Responsive breakpoints for overflow helper classes
/// @type Boolean
$prototype-overflow-breakpoints: $global-prototype-breakpoints !default;

/// Map containing all the `overflow` classes
/// @type Map
$prototype-overflow: (
  visible,
  hidden,
  scroll
) !default;

/// Overflow classes, by default coming through a map `$prototype-overflow`
/// @param {String} $overflow [] Overflow classes
@mixin overflow($overflow) {
  overflow: $overflow !important;
}

/// Overflow classes on horizontal axis, by default coming through a map `$prototype-overflow`
/// @param {String} $overflow [] Overflow classes (horizontal axis)
@mixin overflow-x($overflow) {
  overflow-x: $overflow !important;
}

/// Overflow classes on vertical axis, by default coming through a map `$prototype-overflow`
/// @param {String} $overflow [] Overflow classes (vertical axis)
@mixin overflow-y($overflow) {
  overflow-y: $overflow !important;
}

@mixin foundation-prototype-overflow {
  @each $overflow in $prototype-overflow {
    .overflow-#{$overflow} {
      @include overflow($overflow);
    }
    .overflow-x-#{$overflow} {
      @include overflow-x($overflow);
    }
    .overflow-y-#{$overflow} {
      @include overflow-y($overflow);
    }
  }

  @if ($prototype-overflow-breakpoints) {
    // Loop through Responsive Breakpoints
    @each $size in $breakpoint-classes {
      @include breakpoint($size) {
        @each $overflow in $prototype-overflow {
          @if $size != $-zf-zero-breakpoint {
            .#{$size}-overflow-#{$overflow} {
              @include overflow($overflow);
            }
            .#{$size}-overflow-x-#{$overflow} {
              @include overflow-x($overflow);
            }
            .#{$size}-overflow-y-#{$overflow} {
              @include overflow-y($overflow);
            }
          }
        }
      }
    }
  }
}