sp-codes.de/bower_components/foundation-sites/scss/forms/_select.scss

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

////
/// @group forms
////

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

/// Color of the dropdown triangle inside select menus. Set to `transparent` to remove it entirely.
/// @type Color
$select-triangle-color: $dark-gray !default;

/// Default radius for select menus.
/// @type Color
$select-radius: $global-radius !default;

@mixin form-select {
  $height: ($input-font-size + ($form-spacing * 1.5) - rem-calc(1));

  height: $height;
  padding: ($form-spacing / 2);
  border: $input-border;
  margin: 0 0 $form-spacing;
  font-size: $input-font-size;
  font-family: $input-font-family;
  line-height: normal;
  color: $input-color;
  background-color: $select-background;
  border-radius: $select-radius;
  -webkit-appearance: none;
  -moz-appearance: none;

  @if $select-triangle-color != transparent {
    @include background-triangle($select-triangle-color);
    background-size: 9px 6px;
    background-position: $global-right (-$form-spacing) center;
    background-origin: content-box;
    background-repeat: no-repeat;
    padding-#{$global-right}: ($form-spacing * 1.5);
  }

  // Disabled state
  &:disabled {
    background-color: $input-background-disabled;
    cursor: $input-cursor-disabled;
  }

  // Hide the dropdown arrow shown in newer IE versions
  &::-ms-expand {
    display: none;
  }

  &[multiple] {
    height: auto;
    background-image: none;
  }
}

@mixin foundation-form-select {
  select {
    @include form-select;
  }
}