sp-magic.de/bower_components/foundation-sites/scss/components/_dropdown-menu.scss

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

////
/// @group dropdown-menu
////

/// Enables arrows for items with dropdown menus.
/// @type Boolean
$dropdownmenu-arrows: true !default;

/// Sets dropdown menu arrow color if arrow is used.
/// @type Color
$dropdownmenu-arrow-color: $anchor-color !default;

/// Minimum width of dropdown sub-menus.
/// @type Length
$dropdownmenu-min-width: 200px !default;

/// Background color for dropdowns.
/// @type Color
$dropdownmenu-background: $white !default;

/// Border for dropdown sub-menus.
/// @type List
$dropdownmenu-border: 1px solid $medium-gray !default;

// Border width for dropdown sub-menus.
// Used to adjust top margin of a sub-menu if a border is used.
// @type Length
$dropdownmenu-border-width: nth($dropdownmenu-border, 1);

@mixin left-right-arrows {
  > a::after {
    #{$global-right}: 14px;
    margin-top: -3px;
  }

  &.opens-left > a::after {
    @include css-triangle(5px, $dropdownmenu-arrow-color, left);
  }

  &.opens-right > a::after {
    @include css-triangle(5px, $dropdownmenu-arrow-color, right);
  }
}

@mixin dropdown-menu-direction($dir: horizontal) {
  @if $dir == horizontal {
    > li.opens-left {
      > .is-dropdown-submenu {
        left: auto;
        right: 0;
        top: 100%;
      }
    }

    > li.opens-right {
      > .is-dropdown-submenu {
        right: auto;
        left: 0;
        top: 100%;
      }
    }

    @if $dropdownmenu-arrows {
      > li.is-dropdown-submenu-parent > a {
        padding-#{$global-right}: 1.5rem;
        position: relative;
      }

      > li.is-dropdown-submenu-parent > a::after {
        @include css-triangle(5px, $dropdownmenu-arrow-color, down);
        #{$global-right}: 5px;
        margin-top: -2px;
      }
    }
  }
  @else if $dir == vertical {
    > li {
      .is-dropdown-submenu {
        top: 0;
      }

      &.opens-left {
        > .is-dropdown-submenu {
          left: auto;
          right: 100%;
        }
      }

      &.opens-right {
        > .is-dropdown-submenu {
          right: auto;
          left: 100%;
        }
      }

      @if $dropdownmenu-arrows {
        @include left-right-arrows;
      }
    }
  }
  @else {
    @warn 'The direction used for dropdown-menu-direction() must be horizontal or vertical.';
  }
}

@mixin foundation-dropdown-menu {
  .dropdown.menu {
    @include dropdown-menu-direction(horizontal);

    a {
      @include disable-mouse-outline;
    }

    .no-js & ul {
      display: none;
    }

    &.vertical {
      @include dropdown-menu-direction(vertical);
    }

    @each $size in $breakpoint-classes {
      @if $size != $-zf-zero-breakpoint {
        @include breakpoint($size) {
          &.#{$size}-horizontal {
            @include dropdown-menu-direction(horizontal);
          }

          &.#{$size}-vertical {
            @include dropdown-menu-direction(vertical);
          }
        }
      }
    }

    &.align-right {
      .is-dropdown-submenu.first-sub {
        top: 100%;
        left: auto;
        right: 0;
      }
    }
  }

  .is-dropdown-menu.vertical {
    width: 100px;

    &.align-right {
      float: right;
    }
  }

  .is-dropdown-submenu-parent {
    position: relative;

    a::after {
      position: absolute;
      top: 50%;
      #{$global-right}: 5px;
      margin-top: -2px;
    }

    &.opens-inner > .is-dropdown-submenu {

      top: 100%;
      @if $global-text-direction == 'rtl' {
        right: auto;
      } @else {
        left: auto;
      }
    }

    &.opens-left > .is-dropdown-submenu {
      left: auto;
      right: 100%;
    }

    &.opens-right > .is-dropdown-submenu {
      right: auto;
      left: 100%;
    }
  }

  .is-dropdown-submenu {
    display: none;
    position: absolute;
    top: 0;
    #{$global-left}: 100%;
    min-width: $dropdownmenu-min-width;
    z-index: 1;
    background: $dropdownmenu-background;
    border: $dropdownmenu-border;

    .is-dropdown-submenu-parent {
      @if $dropdownmenu-arrows {
        @include left-right-arrows;
      }
    }

    @if (type-of($dropdownmenu-border-width) == 'number') {
      .is-dropdown-submenu {
        margin-top: (-$dropdownmenu-border-width);
      }
    }

    > li {
      width: 100%;
    }

    // [TODO] Cut back specificity
    // scss-lint:disable SelectorDepth
    //&:not(.js-dropdown-nohover) > .is-dropdown-submenu-parent:hover > &, // why is this line needed? Opening is handled by JS and this causes some ugly flickering when the sub is re-positioned automatically...
    &.js-dropdown-active {
      display: block;
    }
  }
}