Bootstrap class: .carousel-indicators

<div id="carouselExampleIndicators" class="carousel slide" data-ride="carousel">
  <ol class="carousel-indicators">
    <li data-target="#carouselExampleIndicators" data-slide-to="0" class="active"></li>
    <li data-target="#carouselExampleIndicators" data-slide-to="1"></li>
  </ol>
  <div class="carousel-inner" role="listbox">
    <div class="carousel-item active">
      <img class="d-block w-100" src="#" src="/placeholder/pictures/image.svg" alt="First slide">
    </div>
    <div class="carousel-item">
      <img class="d-block w-100" src="#" src="/placeholder/pictures/image.svg" alt="Second slide">
    </div>
  </div>
  <a class="carousel-control-prev" href="#carouselExampleIndicators" 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="#carouselExampleIndicators" role="button" data-slide="next">
    <span class="carousel-control-next-icon" aria-hidden="true"></span>
    <span class="sr-only">Next</span>
  </a>
</div>

Preview

Sass source

/* _carousel.scss:170 */
.carousel-indicators {
  position: absolute;
  right: 0;
  bottom: 10px;
  left: 0;
  z-index: 15;
  display: flex;
  justify-content: center;
  padding-left: 0; // override  default
  // Use the .carousel-control's width as margin so we don't overlay those
  margin-right: $carousel-control-width;
  margin-left: $carousel-control-width;
  list-style: none;

  li {
    position: relative;
    flex: 0 1 auto;
    width: $carousel-indicator-width;
    height: $carousel-indicator-height;
    margin-right: $carousel-indicator-spacer;
    margin-left: $carousel-indicator-spacer;
    text-indent: -999px;
    cursor: pointer;
    background-color: rgba($carousel-indicator-active-bg, .5);

    // Use pseudo classes to increase the hit area by 10px on top and bottom.
    &::before {
      position: absolute;
      top: -10px;
      left: 0;
      display: inline-block;
      width: 100%;
      height: 10px;
      content: "";
    }
    &::after {
      position: absolute;
      bottom: -10px;
      left: 0;
      display: inline-block;
      width: 100%;
      height: 10px;
      content: "";
    }
  }

  .active {
    background-color: $carousel-indicator-active-bg;
  }
}

Uses variables

/* _carousel.scss:170 */
$carousel-control-width
$carousel-control-width
$carousel-indicator-width
$carousel-indicator-height
$carousel-indicator-spacer
$carousel-indicator-spacer
$carousel-indicator-active-bg
$carousel-indicator-active-bg