Bootstrap 3 scss for dropdown only

b3-dropdown.css

.caret {
  display: inline-block;
  width: 0;
  height: 0;
  margin-left: 2px;
  vertical-align: middle;
  border-top: 80px dashed;
  border-top: 80px solid \9;
  border-right: 80px solid transparent;
  border-left: 80px solid transparent;
}

.dropup,
.dropdown {
  position: relative;
}

.dropdown-toggle:focus {
  outline: 0;
}

.dropdown-menu {
  position: absolute;
  top: 100%;
  left: 0;
  z-index: 1200;
  display: none;
  float: left;
  min-width: 160px;
  padding: 5px 0;
  margin: 2px 0 0;
  list-style: none;
  font-size: 28px;
  text-align: left;
  background-color: #fff;
  border: 1px solid #ccc;
  border: 1px solid rgba(0, 0, 0, 0.15);
  border-radius: 0;
  -webkit-box-shadow: 0 6px rgba(0, 0, 0, 0.175);
  background-clip: padding-box;
}
.dropdown-menu.pull-right {
  right: 0;
  left: auto;
}
.dropdown-menu > li > a {
  display: block;
  padding: 3px 20px;
  clear: both;
  font-weight: normal;
  line-height: 28px;
  color: #333333;
  white-space: nowrap;
}

.dropdown-menu > li > a:hover, .dropdown-menu > li > a:focus {
  text-decoration: none;
  color: #262626;
  background-color: #f5f5f5;
}

.dropdown-menu > .active > a, .dropdown-menu > .active > a:hover, .dropdown-menu > .active > a:focus {
  color: #fff;
  text-decoration: none;
  outline: 0;
  background-color: #337ab7;
}

.dropdown-menu > .disabled > a, .dropdown-menu > .disabled > a:hover, .dropdown-menu > .disabled > a:focus {
  color: #777777;
}
.dropdown-menu > .disabled > a:hover, .dropdown-menu > .disabled > a:focus {
  text-decoration: none;
  background-color: transparent;
  background-image: none;
  filter: progid:DXImageTransform.Microsoft.gradient(enabled = false);
  cursor: not-allowed;
}

.open > .dropdown-menu {
  display: block;
}
.open > a {
  outline: 0;
}

.dropdown-menu-right {
  left: auto;
  right: 0;
}

.dropdown-menu-left {
  left: 0;
  right: auto;
}

.dropdown-header {
  display: block;
  padding: 3px 20px;
  font-size: 12px;
  line-height: 28px;
  color: #777777;
  white-space: nowrap;
}

.dropdown-backdrop {
  position: fixed;
  left: 0;
  right: 0;
  bottom: 0;
  top: 0;
  z-index: 1190;
}

.pull-right > .dropdown-menu {
  right: 0;
  left: auto;
}

.dropup .caret,
.navbar-fixed-bottom .dropdown .caret {
  border-top: 0;
  border-bottom: 80px dashed;
  border-bottom: 80px solid \9;
  content: "";
}
.dropup .dropdown-menu,
.navbar-fixed-bottom .dropdown .dropdown-menu {
  top: auto;
  bottom: 100%;
  margin-bottom: 2px;
}

@media (min-width: 768px) {
  .navbar-right .dropdown-menu {
    right: 0;
    left: auto;
  }
  .navbar-right .dropdown-menu-left {
    left: 0;
    right: auto;
  }
}

b3-dropdown.scss

// ----
// Sass (v3.4.21)
// Compass (v1.0.3)
// ----


$brand-primary:         darken(#428bca, 6.5%); // #337ab7

$gray-base:              #000;
$gray-darker:            lighten($gray-base, 13.5%); // #222
$gray-dark:              lighten($gray-base, 20%);  // #333
$gray-light:             lighten($gray-base, 46.7%); // #777
$gray-lighter:           lighten($gray-base, 93.5%); // #eee

$cursor-disabled:                not-allowed;

$font-size-base:          14px;
$font-size-large:         ceil(($font-size-base * 1.25)); // ~18px
$font-size-small:         ceil(($font-size-base * 0.85)); // ~12px


$screen-sm:                  768px;
$screen-sm-min:              $screen-sm;

$grid-float-breakpoint:     $screen-sm-min;


//** Global color for active items (e.g., navs or dropdowns).
$component-active-color:    #fff;
//** Global background color for active items (e.g., navs or dropdowns).
$component-active-bg:       $brand-primary;

//** Width of the `border` for generating carets that indicate dropdowns.
$caret-width-base:          4px;
//** Carets increase slightly in size for larger components.
$caret-width-large:         5px;

//
// Dropdown menus
// --------------------------------------------------

$caret-width-base: 80px;
$zindex-dropdown: 1200;
$font-size-base: 28px;
$dropdown-bg: #ffffff;
$dropdown-fallback-border: 1px solid #ddd;
$dropdown-border: 1px solid #ddd;
$border-radius-base: 0;
$shadow: 0 6px rgba(0,0,0,.175);
$line-height-base: 28px;


//** Background for the dropdown menu.
$dropdown-bg:                    #fff;
//** Dropdown menu `border-color`.
$dropdown-border:                rgba(0,0,0,.15);
//** Dropdown menu `border-color` **for IE8**.
$dropdown-fallback-border:       #ccc;
//** Divider color for between dropdown items.
$dropdown-divider-bg:            #e5e5e5;

//** Dropdown link text color.
$dropdown-link-color:            $gray-dark;
//** Hover color for dropdown links.
$dropdown-link-hover-color:      darken($gray-dark, 5%);
//** Hover background for dropdown links.
$dropdown-link-hover-bg:         #f5f5f5;

//** Active dropdown menu item text color.
$dropdown-link-active-color:     $component-active-color;
//** Active dropdown menu item background color.
$dropdown-link-active-bg:        $component-active-bg;

//** Disabled dropdown menu item background color.
$dropdown-link-disabled-color:   $gray-light;

//** Text color for headers within dropdown menus.
$dropdown-header-color:          $gray-light;

//** Deprecated `@dropdown-caret-color` as of v3.1.0
$dropdown-caret-color:           #000;

@mixin box-shadow($shadow) {
  -webkit-box-shadow: $shadow; 
}

@mixin reset-filter() {
  filter: progid:DXImageTransform.Microsoft.gradient(enabled = false);
}

// Dropdown arrow/caret
.caret {
  display: inline-block;
  width: 0;
  height: 0;
  margin-left: 2px;
  vertical-align: middle;
  border-top:   $caret-width-base dashed;
  border-top:   $caret-width-base solid \9; // IE8
  border-right: $caret-width-base solid transparent;
  border-left:  $caret-width-base solid transparent;
}

// The dropdown wrapper (div)
.dropup,
.dropdown {
  position: relative;
}

// Prevent the focus on the dropdown toggle when closing dropdowns
.dropdown-toggle:focus {
  outline: 0;
}

// The dropdown menu (ul)
.dropdown-menu {
  position: absolute;
  top: 100%;
  left: 0;
  z-index: $zindex-dropdown;
  display: none; // none by default, but block on "open" of the menu
  float: left;
  min-width: 160px;
  padding: 5px 0;
  margin: 2px 0 0; // override default ul
  list-style: none;
  font-size: $font-size-base;
  text-align: left; // Ensures proper alignment if parent has it changed (e.g., modal footer)
  background-color: $dropdown-bg;
  border: 1px solid $dropdown-fallback-border; // IE8 fallback
  border: 1px solid $dropdown-border;
  border-radius: $border-radius-base;
  @include box-shadow(0 6px rgba(0,0,0,.175));
  background-clip: padding-box;

  // Aligns the dropdown menu to right
  //
  // Deprecated as of 3.1.0 in favor of `.dropdown-menu-[dir]`
  &.pull-right {
    right: 0;
    left: auto;
  }

  // Dividers (basically an hr) within the dropdown
  // .divider {
  //   @include nav-divider($dropdown-divider-bg);
  // }

  // Links within the dropdown menu
  > li > a {
    display: block;
    padding: 3px 20px;
    clear: both;
    font-weight: normal;
    line-height: $line-height-base;
    color: $dropdown-link-color;
    white-space: nowrap; // prevent links from randomly breaking onto new lines
  }
}

// Hover/Focus state
.dropdown-menu > li > a {
  &:hover,
  &:focus {
    text-decoration: none;
    color: $dropdown-link-hover-color;
    background-color: $dropdown-link-hover-bg;
  }
}

// Active state
.dropdown-menu > .active > a {
  &,
  &:hover,
  &:focus {
    color: $dropdown-link-active-color;
    text-decoration: none;
    outline: 0;
    background-color: $dropdown-link-active-bg;
  }
}

// Disabled state
//
// Gray out text and ensure the hover/focus state remains gray

.dropdown-menu > .disabled > a {
  &,
  &:hover,
  &:focus {
    color: $dropdown-link-disabled-color;
  }

  // Nuke hover/focus effects
  &:hover,
  &:focus {
    text-decoration: none;
    background-color: transparent;
    background-image: none; // Remove CSS gradient
    @include reset-filter;
    cursor: $cursor-disabled;
  }
}

// Open state for the dropdown
.open {
  // Show the menu
  > .dropdown-menu {
    display: block;
  }

  // Remove the outline when :focus is triggered
  > a {
    outline: 0;
  }
}

// Menu positioning
//
// Add extra class to `.dropdown-menu` to flip the alignment of the dropdown
// menu with the parent.
.dropdown-menu-right {
  left: auto; // Reset the default from `.dropdown-menu`
  right: 0;
}
// With v3, we enabled auto-flipping if you have a dropdown within a right
// aligned nav component. To enable the undoing of that, we provide an override
// to restore the default dropdown menu alignment.
//
// This is only for left-aligning a dropdown menu within a `.navbar-right` or
// `.pull-right` nav component.
.dropdown-menu-left {
  left: 0;
  right: auto;
}

// Dropdown section headers
.dropdown-header {
  display: block;
  padding: 3px 20px;
  font-size: $font-size-small;
  line-height: $line-height-base;
  color: $dropdown-header-color;
  white-space: nowrap; // as with > li > a
}

// Backdrop to catch body clicks on mobile, etc.
.dropdown-backdrop {
  position: fixed;
  left: 0;
  right: 0;
  bottom: 0;
  top: 0;
  z-index: ($zindex-dropdown - 10);
}

// Right aligned dropdowns
.pull-right > .dropdown-menu {
  right: 0;
  left: auto;
}

// Allow for dropdowns to go bottom up (aka, dropup-menu)
//
// Just add .dropup after the standard .dropdown class and you're set, bro.
// TODO: abstract this so that the navbar fixed styles are not placed here?

.dropup,
.navbar-fixed-bottom .dropdown {
  // Reverse the caret
  .caret {
    border-top: 0;
    border-bottom: $caret-width-base dashed;
    border-bottom: $caret-width-base solid \9; // IE8
    content: "";
  }
  // Different positioning for bottom up menu
  .dropdown-menu {
    top: auto;
    bottom: 100%;
    margin-bottom: 2px;
  }
}


// Component alignment
//
// Reiterate per navbar.less and the modified component alignment there.

@media (min-width: $grid-float-breakpoint) {
  .navbar-right {
    .dropdown-menu {
      right: 0; left: auto;
    }
    // Necessary for overrides of the default right aligned menu.
    // Will remove come v4 in all likelihood.
    .dropdown-menu-left {
      left: 0; right: auto;
    }
  }
}