@include b(nav-bar) {
  @include flex-x(space-between);
  &-border {
    @include border($bottom: 0, $left: 0);
  }

  position: relative;
  width: 100%;
  height: 44px;
  line-height: 44px;
  background-color: $white;
  color: $primary-text-color;
  font-size: 24px;
  &-middle {
    margin: 0 auto;
    text-align: center;
    color: #333;
    font-size: $size-18;
  }
  &-left-block,
  &-right-block {
    @include flex-x();

    position: absolute;
    color: $primary-color;
    font-size: $size-16;
    cursor: pointer;
  }
  &-left-block {
    left: 15px;
  }
  &-right-block {
    right: 15px;
  }
  &-left,
  &-left-append,
  &-right,
  &-right-append {
    @include link-feed-back();

    display: block;
  }
  &-fixed {
    position: fixed;
    top: 0;
    left: 0;
  }
}