如何在bootstrap多项轮播列和上一步和下一步按钮之间放置间隙

<div id="myCarousel" class="carousel slide" data-ride="carousel">
  <!-- 轮播项 -->
  <div class="carousel-inner">
    <div class="carousel-item active">
      <!-- 轮播内容 -->
    </div>
    <<div class="carousel-item">
      <!-- 轮播内容 -->
    </div>
    <div class="carousel-item">
      <!-- 轮播内容 -->
    </div>
  </div>
  
  <!-- 上一步、下一步按钮 -->
  <a class="carousel-control-prev" href="#myCarousel" role="button" data-slide="prev">
    <span class="carousel-control-prev-icon" aria-hidden="true"></span>
    <span class="sr-only">Previous</span>
  </a>
  <a class="carousel-control-next" href="#myCarousel" role="button" data-slide="next">
    <span class="carousel-control-next-icon" aria-hidden="true"></span>
    <span class="sr-only">Next</span>
  </a>
</div>

.carousel-item {
  margin-right: 20px;
}

.carousel-control-prev {
  margin-right: 20px;
}

.carousel-control-next {
  margin-left: 20px;
}