front__codeschool-angular-2/app/sass/structures/_dropdown.sass

// *************************************
//
//   Dropdown
//   -> Dropdown menus
//
// -------------------------------------
//   Template (Haml)
// -------------------------------------
//
// .dropdown(.is-active)
//   %a.dropdown-btn.btn{href: '#'} Button
//   %ul.dropdown-menu.list
//     %li.dropdown-item.list-item(.is-active)
//       %a.dropdown-item-link.list-item-link{href: '#'} Item
//     %li.dropdown-item.list-item(.is-active)
//       %a.dropdown-item-link.list-item-link{href: '#'} Item
//
// *************************************

// ----- Dropdown ----- //

$dropdown-width: 150px
$b-transitionSpeed: 0.3s

.dropdown
  max-width: $dropdown-width
  position: relative
  width: auto
  z-index: 30

// -------------------------------------
//   States
// -------------------------------------

// ----- Active ----- //

.dropdown:hover

  .dropdown-btn
    color: $c-text-invert
    &::after
      color: $c-text-invert

  .dropdown-menu
    @extend %fauxShow
    +transition(opacity $b-transitionSpeed ease-in-out, top $b-transitionSpeed ease-in-out)
    top: 130%

// -------------------------------------
//   Context
// -------------------------------------

.has-dropdown
  overflow: visible

// -------------------------------------
//   Scaffolding
// -------------------------------------

// ----- Button ----- //

.dropdown-btn
  $placement: 'after'
  // @extend %icn
  // @extend %icn--#{$placement}
  // @extend %icn--arrowDown--alt--#{$placement}
  display: block
  &:hover,
  &:focus
    &::#{$placement}
      color: $c-text-invert
  &::#{$placement}
    color: $c-highlight
    font-size: 7px // IE being a jerk.
    left: auto
    line-height: 30px // IE being a jerk.
    padding-left: (1.25 * $b-space)
    padding-right: (1.25 * $b-space)

// ----- Item ----- //

.dropdown-item
  border-bottom: $b-border
  margin: 0
  &:last-child
    border: 0
  &:hover
    background: darken(#fff, 15%)

// Link

.dropdown-item-link
  border: 0
  display: block
  padding: $b-space-s $b-space

// ----- Menu ----- //

.dropdown-menu
  @extend %boxSizing
  @extend %card
  @extend %fauxHide
  border-radius: 0
  font-size: $b-fontSize-m
  left: 50%
  margin-left: -($dropdown-width / 2)
  padding: 0
  position: absolute
  text-align: center
  top: 3.5 * $b-space
  width: $dropdown-width
  z-index: 10
  &::after
    +caret('top', 8px, $c-text-invert)