.app-collapse-panel {
  border-bottom: 1px solid #d9d9d9;
  .app-collapse-panel-header {
    position: relative;
    padding: 12px 16px 12px 40px;
    color: rgba(0, 0, 0, 0.85);
    line-height: 22px;
    cursor: pointer;
    transition: all 0.3s;
    .app-collapse-panel-arrow {
      color: inherit;
      font-style: normal;
      line-height: 0;
      text-align: center;
      text-transform: none;
      vertical-align: -0.125em;
      text-rendering: optimizeLegibility;
      -webkit-font-smoothing: antialiased;
      -moz-osx-font-smoothing: grayscale;
      position: absolute;
      top: 50%;
      left: 16px;
      display: inline-block;
      font-size: 12px;
      transform: translateY(-50%);
      transition: all 0.2s;
      &.app-collapse-panel-arrow-down {
        transform: translateY(-50%) rotate(90deg);
      }
    }
  }
  .app-collapse-panel-box {
    overflow: hidden;
    color: rgba(0, 0, 0, 0.65);
    background-color: #fff;
    border-top: 1px solid #d9d9d9;
    transition: height 0.2s;
    &.app-collapse-panel-box--hidden {
      height: 0px;
      border-top-width: 0px;
    }
    .app-collapse-panel-boxItem {
      padding: 16px;
    }
  }
}
