message: feat(ContactList): refactor style & add new prop defaultTagText
diff: }
  &__item-value {
  + display: flex;
  + align-items: center;
  padding-right: @padding-xl;
  + padding-left: @padding-xs;
  + }
  +
  + &__item-tag {
  + flex: none;
  + margin-left: @padding-xs;
  + padding-top: 0;
  + padding-bottom: 0;
  + line-height: 1.4em;
  }
  &__group {
  -webkit-overflow-scrolling: touch;
  }
  - &__name {
  - font-weight: @font-weight-bold;
  - font-size: @font-size-md;
  - line-height: 20px;
  - }
  -
  &__edit {
  - position: absolute;
  - top: 50%;
  - right: @padding-md;
  font-size: @contact-list-edit-icon-size;
  - transform: translate(0, -50%);
  }
  - &__add {
  + &__bottom {
  position: fixed;
  + right: 0;
  bottom: 0;
  left: 0;
  z-index: @contact-list-add-button-z-index;
  + padding: 5px 16px;
  + background-color: #fff;
  + }
  +
  + &__add {
  + height: 40px;
  + line-height: 38px;
  }
  }
  