<!-- Sliderを包むコンテナ要素 -->
<div id="navigation" class="swiper">
  <!-- スライド要素を包む要素 -->
  <div class="swiper-wrapper">
    <!-- 各スライド -->
    <div class="swiper-slide slide1">
      <p>slide1</p>
    </div>
    <div class="swiper-slide slide2">
      <p>slide2</p>
    </div>
    <div class="swiper-slide slide3">
      <p>slide3</p>
    </div>
  </div>
  <div class="swiper-button-prev"></div>
  <div class="swiper-button-next"></div>
</div>

.swiper {
  /*スライダーの幅と高さを調整*/
  width: 90%;
  height: 200px;
  margin: 0.5rem auto;
}

.swiper-slide {
  /*スライド要素の幅と高さを調整*/
  width: 100%;
  height: 100%;

  /*テキストの位置調整*/
  display: flex;
  justify-content: center;
  align-items: center;

  /*テキストの色と太さを指定*/
  color: #fff;
  font-weight: bold;
}

/*各スライドの背景色の設定*/
.slide1 {
  background-color: #88acbd;
}

.slide2 {
  background-color: #99cb1f;
}

.slide3 {
  background-color: #e43a47;
}

const navigation = new Swiper("#navigation", {
  navigation: {
    nextEl: ".swiper-button-next", //必須
    prevEl: ".swiper-button-prev" //必須
  }
});