@include b(tabbar) {
  position: relative;
  display: flex;
  flex-direction: row;
  justify-content: space-around;
  align-items: center;
  height: 50px;
  background-color: #fff;
  cursor: pointer;
  &-fixed {
    position: fixed;
    right: 0;
    bottom: 0;
    left: 0;
  }
  &-border-top {
    @include border($position:before, $top: 0, $left: 0);
  }
  &-border-bottom {
    @include border($position:after, $bottom: 0, $left: 0);
  }
}