app/addons/components/assets/scss/bulk-selector.scss

// Licensed under the Apache License, Version 2.0 (the "License"); you may not
// use this file except in compliance with the License. You may obtain a copy of
// the License at
//
//   http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
// License for the specific language governing permissions and limitations under
// the License.

#bulk-action-component-popover {
  font-size: 13px;

  i.icon {
    margin-right: 10px;
  }

  ul {
    margin: inherit;
  }

  li {
    padding: 14px 15px;
    line-height: 0;
    cursor: pointer;
    list-style-type: none;

    &.disabled {
      cursor: default;
      color: $cf-text02-muted;
    }

    &:hover {
      background-color: $cf-brand-hightlight-hover;
    }
    &:last-child {
      -webkit-border-bottom-right-radius: 5px;
      -webkit-border-bottom-left-radius: 5px;
      -moz-border-radius-bottomright: 5px;
      -moz-border-radius-bottomleft: 5px;
      border-bottom-right-radius: 5px;
      border-bottom-left-radius: 5px;
    }
  }
  .popover-title {
    margin: -1px;
  }

  .popover {
    left: 10px !important;

    .arrow {
      margin-left: -39px;
    }
  }

  .popover-content {
    padding: 0;
  }
}

.bulk-action-component {
  min-height: 43px;

  button {
    height: 30px;
    width: 30px;
    background-color: $cf-background01;
    border: 1px solid $cf-border-color01;
    margin-left: 7px;
  }

  .separator {
    border-left: 1px solid $cf-border-color01;
    margin: 5px 0;
    height: 15px;
  }

  .bulk-action-component-panel {
    input[type="checkbox"] {
      margin: 6px;
      font-size: 0.875rem;
    }

    border: 1px solid $cf-border-color01;
    min-height: 30px;
    position: relative;
    float: left;
    div.arrow-button {
      height: 24px;
      width: 24px;
      transform: rotate(90deg);
      cursor: pointer;
      i {
        margin-left: 10px;
      }
    }
  }
}