frontend/src/styles/components/base/multiselect.scss

fieldset[disabled] .multiselect {
  pointer-events: none;
}

.multiselect__spinner {
  position: absolute;
  right: 1px;
  top: 1px;
  width: 48px;
  height: 35px;
  background: $white;
  display: block;

  &:before, &:after {
    position: absolute;
    content: "";
    top: 50%;
    left: 50%;
    margin: -8px 0 0 -8px;
    width: 16px;
    height: 16px;
    border-radius: 100%;
    border-color: $multiselect_primary transparent transparent;
    border-style: solid;
    border-width: 2px;
    box-shadow: 0 0 0 1px transparent;
  }
  &:before {
    animation: spinning 2.4s cubic-bezier(0.41, 0.26, 0.2, 0.62);
    animation-iteration-count: infinite;
  }
  &:after {
    animation: spinning 2.4s cubic-bezier(0.51, 0.09, 0.21, 0.8);
    animation-iteration-count: infinite;
  }
}

.multiselect__loading-enter-active, .multiselect__loading-leave-active {
  transition: opacity 0.4s ease-in-out;
  opacity: 1;
}

.multiselect__loading-enter, .multiselect__loading-leave-active {
  opacity: 0;
}

.multiselect, .multiselect__input, .multiselect__single {
  font-family: inherit;
  font-size: 16px;
  touch-action: manipulation;
}

.multiselect {
  box-sizing: content-box;
  display: block;
  position: relative;
  width: 100%;
  min-height: 40px;
  text-align: left;
  color: $text;
  * {
    box-sizing: border-box;
  }
  &:focus {
    outline: none;
  }
}

.multiselect--disabled {
  pointer-events: none;
  opacity: 0.6;
}

.multiselect--active {
  z-index: 50;
  &:not(.multiselect--above) {
    .multiselect__current, .multiselect__input, .multiselect__tags {
      border-bottom-left-radius: 0;
      border-bottom-right-radius: 0;
    }
  }
  .multiselect__select {
    transform: rotateZ(180deg);
  }
}

.multiselect--above.multiselect--active {
  .multiselect__current, .multiselect__input, .multiselect__tags {
    border-top-left-radius: 0;
    border-top-right-radius: 0;
  }
}

.multiselect__input, .multiselect__single {
  position: relative;
  display: inline-block;
  min-height: 20px;
  line-height: 20px;
  border: none;
  border-radius: 5px;
  background: $white;
  padding: 0 0 0 5px;
  width: calc(100%);
  transition: border 0.1s ease;
  box-sizing: border-box;
  margin-bottom: 8px;
  vertical-align: top;
}

.multiselect__input::placeholder {
  color: $multiselect-dark;
}

.multiselect__tag ~ {
  .multiselect__input, .multiselect__single {
    width: auto;
  }
}

.multiselect__input:hover, .multiselect__single:hover {
  border-color: darken($white, 10);
}

.multiselect__input:focus {
  border-color: $primary;
  outline: none;
}

.multiselect__single {
  &:focus {
    border-color: $primary;
    outline: none;
  }
  padding-left: 5px;
  margin-bottom: 8px;
}

.multiselect__tags-wrap {
  display: inline;

  .user {
    display: inline-block;
    min-height: 30px;
    margin: 0 0 .5em;
  }
}

.multiselect__tags {
  display: block;
  padding: 8px 40px 0 8px;
  border-radius: 5px;
  border: 1px solid $multiselect-border;
  background: $white;
  font-size: 14px;
}

.multiselect__tag {
  position: relative;
  display: inline-block;
  padding: 4px 26px 4px 10px;
  border-radius: 5px;
  margin-right: 10px;
  color: $white;
  line-height: 1;
  background: $multiselect-highlight;
  margin-bottom: 5px;
  white-space: nowrap;
  overflow: hidden;
  max-width: 100%;
  text-overflow: ellipsis;
}

.multiselect__tag-icon {
  cursor: pointer;
  margin-left: 7px;
  position: absolute;
  right: 0;
  top: 0;
  bottom: 0;
  font-weight: 700;
  font-style: initial;
  width: 22px;
  text-align: center;
  line-height: 22px;
  transition: all 0.2s ease;
  border-radius: 5px;
  &:after {
    content: "×";
    color: darken($multiselect-highlight, 20);
    font-size: 14px;
  }
  &:focus, &:hover {
    background: lighten($multiselect-highlight, 10);
  }
  &:focus:after, &:hover:after {
    color: $white;
  }
}

.multiselect__current {
  line-height: 16px;
  min-height: 40px;
  box-sizing: border-box;
  display: block;
  overflow: hidden;
  padding: 8px 30px 0 12px;
  white-space: nowrap;
  margin: 0;
  text-decoration: none;
  border-radius: 5px;
  border: 1px solid $multiselect-border;
  cursor: pointer;
}

.multiselect__select {
  line-height: 16px;
  display: block;
  position: absolute;
  box-sizing: border-box;
  width: 40px;
  height: 38px;
  right: 1px;
  top: 1px;
  padding: 4px 8px;
  margin: 0;
  text-decoration: none;
  text-align: center;
  cursor: pointer;
  transition: transform 0.2s ease;
  &:before {
    position: relative;
    right: 0;
    top: 65%;
    color: darken($multiselect-border, 30);
    margin-top: 4px;
    border-style: solid;
    border-width: 5px 5px 0 5px;
    border-color: darken($multiselect-border, 30) transparent transparent transparent;
    content: "";
  }
}

.multiselect__placeholder {
  color: darken($white, 15);
  display: inline-block;
  margin-bottom: 10px;
  padding-top: 2px;
}

.multiselect--active .multiselect__placeholder {
  display: none;
}

.multiselect__content-wrapper {
  position: absolute;
  display: block;
  background: $white;
  width: 100%;
  max-height: 240px;
  overflow: auto;
  border: 1px solid $multiselect-border;
  border-top: none;
  border-bottom-left-radius: 5px;
  border-bottom-right-radius: 5px;
  z-index: 50;
  -webkit-overflow-scrolling: touch;
}

.multiselect__content, .content ul.multiselect__content {
  list-style: none;
  display: inline-block;
  padding: 0;
  margin: 0;
  min-width: 100%;
  vertical-align: top;

  li + li {
    margin: 0;
  }
}

.multiselect--above .multiselect__content-wrapper {
  bottom: 100%;
  border-radius: 5px 5px 0 0;
  border-bottom: none;
  border-top: 1px solid $multiselect-border;
}

.multiselect__content::webkit-scrollbar {
  display: none;
}

.multiselect__element {
  display: block;
}

.multiselect__option {
  display: block;
  padding: 12px;
  min-height: 40px;
  line-height: 16px;
  text-decoration: none;
  text-transform: none;
  vertical-align: middle;
  position: relative;
  cursor: pointer;
  white-space: nowrap;
  &:after {
    top: 0;
    right: 0;
    position: absolute;
    line-height: 40px;
    padding-right: 12px;
    padding-left: 20px;
    font-size: 13px;
  }
}

.multiselect__option--highlight {
  background: $multiselect-highlight;
  outline: none;
  color: $white;
  &:after {
    content: attr(data-select);
    background: $multiselect-highlight;
    color: $white;
  }
}

.multiselect__option--selected {
  background: darken($white, 10);
  color: $multiselect-dark;
  font-weight: bold;
  &:after {
    content: attr(data-selected);
    color: silver;
  }
  &.multiselect__option--highlight {
    background: $multiselect-highlight-negative;
    color: $white;
    &:after {
      background: $multiselect-highlight-negative;
      content: attr(data-deselect);
      color: $white;
    }
  }
}

.multiselect--disabled {
  pointer-events: none;
  .multiselect__current, .multiselect__select {
    background: $multiselect-disabled;
    color: darken($multiselect-disabled, 40);
  }
}

.multiselect__option--disabled {
  background: $multiselect-disabled !important;
  color: darken($multiselect-disabled, 40) !important;
  cursor: text;
  pointer-events: none;
}

.multiselect__option--group {
  background: $multiselect-disabled;
  color: $multiselect-dark;
  &.multiselect__option--highlight {
    background: $multiselect-dark;
    color: $white;
    &:after {
      background: $multiselect-dark;
    }
  }
}

.multiselect__option--disabled.multiselect__option--highlight {
  background: $multiselect-disabled;
}

.multiselect__option--group-selected.multiselect__option--highlight {
  background: $multiselect-highlight-negative;
  color: $white;
  &:after {
    background: $multiselect-highlight-negative;
    content: attr(data-deselect);
    color: $white;
  }
}

.multiselect-enter-active, .multiselect-leave-active {
  transition: all 0.15s ease;
}

.multiselect-enter, .multiselect-leave-active {
  opacity: 0;
}

.multiselect__strong {
  margin-bottom: 8px;
  line-height: 20px;
  display: inline-block;
  vertical-align: top;
}

*[dir="rtl"] {
  .multiselect {
    text-align: right;
  }
  .multiselect__select {
    right: auto;
    left: 1px;
  }
  .multiselect__tags {
    padding: 8px 8px 0px 40px;
  }
  .multiselect__content {
    text-align: right;
  }
  .multiselect__option:after {
    right: auto;
    left: 0;
  }
  .multiselect__clear {
    right: auto;
    left: 12px;
  }
  .multiselect__spinner {
    right: auto;
    left: 1px;
  }
}

@keyframes spinning {
  from {
    transform: rotate(0);
  }

  to {
    transform: rotate(2turn);
  }
}

.multiselect__tags {
  .remove-assignee {
    vertical-align: bottom;
    color: $red;
    margin-left: -1.8em;
    background: $white;
    padding: 0 4px;
    display: inline-block;
    border-radius: 100%;
    font-size: .8em;
    width: 18px;
    height: 18px;
  }
}