<div class="container">
  <div class="row" id="bdtContainer">
    <div class="carouselContainer" id="carouselMain">
      <div class="carouselInner">
        <div class="imgSlide">
          <img src="http://placehold.it/720x405/63393E?text=" class="img-responsive" alt="">
          <a href="" class="visitBtn"><i class="fa fa-hand-o-right" aria-hidden="true"></i></a>
        </div>
        <div class="imgSlide">
          <img src="http://placehold.it/720x405/FD5B03?text=" class="img-responsive" alt="">
          <a href="" class="visitBtn"><i class="fa fa-hand-o-right" aria-hidden="true"></i></a>
        </div>
        <div class="imgSlide">
          <img src="http://placehold.it/720x405/1DABB8?text=" class="img-responsive" alt="">
          <a href="" class="visitBtn"><i class="fa fa-hand-o-right" aria-hidden="true"></i></a>
        </div>
      </div>
      <div class="prevBtn"><i class="fa fa-caret-left" aria-hidden="true"></i></div>
      <div class="nextBtn"><i class="fa fa-caret-right" aria-hidden="true"></i></div>
    </div>
    <div class="Left">
      <div class="carouselContainerLeft">
        <div class="carouselInner" id="carouselInnerLeft">
          <div class="imgSlide">
            <img src="http://placehold.it/720x405/1DABB8?text=" class="img-responsive" alt="">
            <a href="" class="visitBtn"><i class="fa fa-hand-o-right" aria-hidden="true"></i></a>
          </div>
          <div class="imgSlide">
            <img src="http://placehold.it/720x405/63393E?text=" class="img-responsive" alt="">
            <a href="" class="visitBtn"><i class="fa fa-hand-o-right" aria-hidden="true"></i></a>
          </div>
          <div class="imgSlide">
            <img src="http://placehold.it/720x405/FD5B03?text=" class="img-responsive" alt="">
            <a href="" class="visitBtn"><i class="fa fa-hand-o-right" aria-hidden="true"></i></a>
          </div>
        </div>
      </div>
    </div>
    <div class="Right">
      <div class="carouselContainerRight">
        <div class="carouselInner" id="carouselInnerRight">
          <div class="imgSlide">
            <img src="http://placehold.it/720x405/FD5B03?text=" class="img-responsive" alt="">
            <a href="" class="visitBtn"><i class="fa fa-hand-o-right" aria-hidden="true"></i></a>
          </div>
          <div class="imgSlide">
            <img src="http://placehold.it/720x405/1DABB8?text=" class="img-responsive" alt="">
            <a href="" class="visitBtn"><i class="fa fa-hand-o-right" aria-hidden="true"></i></a>
          </div>
          <div class="imgSlide">
            <img src="http://placehold.it/720x405/63393E?text=" class="img-responsive" alt="">
            <a href="" class="visitBtn"><i class="fa fa-hand-o-right" aria-hidden="true"></i></a>
          </div>
        </div>
      </div>
    </div>
  </div>
</div>

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

#bdtContainer {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
  position: relative;
}

#carouselMain {
  -webkit-box-shadow: 0px 0px 20px 0px rgba(0, 0, 0, 0.25);
  -moz-box-shadow: 0px 0px 20px 0px rgba(0, 0, 0, 0.25);
  box-shadow: 0px 0px 20px 0px rgba(0, 0, 0, 0.25);
}

.carouselContainer {
  width: 720px;
  height: 405px;
  overflow: hidden;
  position: relative;
  .carouselInner {
    display: flex;
    position: absolute;
    transition: left ease-out 0.3s;
    .imgSlide {
      width: 720px;
      height: 405px;
      position: relative;
      .visitBtn {
        position: absolute;
        bottom: 40px;
        right: 40px;
        width: 30px;
        height: 30px;
        color: #f4f4f4;
        line-height: 30px;
        border: 1px solid #f4f4f4;
        text-align: center;
        opacity: 0;
        transition: all ease-in-out 0.3s;
      }
    }
    &:hover .visitBtn {
      opacity: 0.5;
    }
  }
  .prevBtn,
  .nextBtn {
    position: absolute;
    top: 50%;
    right: 0;
    font-size: 2em;
    width: 40px;
    height: 40px;
    color: #f4f4f4;
    text-align: center;
    line-height: 40px;
    cursor: pointer;
    opacity: 0;
    transform: translateY(-50%);
    transition: all ease-in-out 0.3s;
  }
  .prevBtn {
    left: 0;
  }
  &:hover .nextBtn,
  &:hover .prevBtn {
    opacity: 0.5;
  }
}

.Left {
  position: absolute;
  left: 0;
  z-index: -10;
}

.carouselContainerLeft {
  width: 640px;
  height: 360px;
  overflow: hidden;
  position: relative;
  .carouselInner {
    display: flex;
    position: absolute;
    transition: left ease-out 0.3s;
    .imgSlide {
      width: 640px;
      height: 360px;
      position: relative;
      .visitBtn {
        position: absolute;
        bottom: 40px;
        right: 40px;
        width: 30px;
        height: 30px;
        color: #f4f4f4;
        line-height: 30px;
        border: 1px solid #f4f4f4;
        text-align: center;
        opacity: 0;
        transition: all ease-in-out 0.3s;
      }
    }
    &:hover .visitBtn {
      opacity: 0.5;
    }
  }
  .prevBtn,
  .nextBtn {
    position: absolute;
    top: 50%;
    right: 0;
    font-size: 2em;
    width: 40px;
    height: 40px;
    color: #f4f4f4;
    text-align: center;
    line-height: 40px;
    cursor: pointer;
    opacity: 0;
    transform: translateY(-50%);
    transition: all ease-in-out 0.3s;
  }
  .prevBtn {
    left: 0;
  }
  &:hover .nextBtn,
  &:hover .prevBtn {
    opacity: 0.5;
  }
}

.Right {
  position: absolute;
  right: 0;
  z-index: -20;
}

.carouselContainerRight {
  width: 640px;
  height: 360px;
  overflow: hidden;
  position: relative;
  .carouselInner {
    display: flex;
    position: absolute;
    transition: left ease-out 0.3s;
    .imgSlide {
      width: 640px;
      height: 360px;
      position: relative;
      .visitBtn {
        position: absolute;
        bottom: 40px;
        right: 40px;
        width: 30px;
        height: 30px;
        color: #f4f4f4;
        line-height: 30px;
        border: 1px solid #f4f4f4;
        text-align: center;
        opacity: 0;
        transition: all ease-in-out 0.3s;
      }
    }
    &:hover .visitBtn {
      opacity: 0.5;
    }
  }
  .prevBtn,
  .nextBtn {
    position: absolute;
    top: 50%;
    right: 0;
    font-size: 2em;
    width: 40px;
    height: 40px;
    color: #f4f4f4;
    text-align: center;
    line-height: 40px;
    cursor: pointer;
    opacity: 0;
    transform: translateY(-50%);
    transition: all ease-in-out 0.3s;
  }
  .prevBtn {
    left: 0;
  }
  &:hover .nextBtn,
  &:hover .prevBtn {
    opacity: 0.5;
  }
}

var carousel = document.getElementsByClassName('carouselContainer');

[].forEach.call(carousel, function(c) {
  console.log(c);
  let prev = c.getElementsByClassName('prevBtn')[0],
      next = c.getElementsByClassName('nextBtn')[0],
      inner = c.getElementsByClassName('carouselInner')[0],
      innerLeft = document.getElementById('carouselInnerLeft'),
      slidesLeft = innerLeft.getElementsByClassName('imgSlide'),
      innerRight = document.getElementById('carouselInnerRight'),
      slidesRight = innerRight.getElementsByClassName('imgSlide'),
      slides = inner.getElementsByClassName('imgSlide'),
      width = 720, slideIndex = 0, widthSmall = 640;

      function slideShow() {
        inner.style.left = -width * slideIndex + 'px';
        innerLeft.style.left = -widthSmall * slideIndex + 'px';
        innerRight.style.left = -widthSmall * slideIndex + 'px';
      }

      prev.addEventListener('click', function () {
        slideIndex--;
        if (slideIndex < 0) {
          slideIndex = slides.length - 1;
        }
        slideShow();
      });
      next.addEventListener('click', function () {
        slideIndex++;
        if (slideIndex >= slides.length) {
          slideIndex = 0;
        }
        slideShow();
      });

});