@include b(pull-refresh) {
  position: relative;
  user-select: none;
  overflow: hidden;
  &-track {
    position: relative;
  }
  &-head {
    position: absolute;
    left: 0;
    overflow: hidden;
    width: 100%;
    height: 50px;
    line-height: 50px;
    text-align: center;
    background: transparent;
    color: $auxiliary-text-color;
    opacity: 1;
    vertical-align: middle;
    transform: translateY(-100%);
    transition: all 50ms ease;
  }
  &-text {
    color: $auxiliary-text-color;
  }
  &-loading {
    display: flex;
    justify-content: center;
    align-items: center;
    .fs-loading {
      height: 16px;
      margin-right: 10px;
      line-height: 16px;
    }
  }
}