<div class="splide" aria-label="Splideで作るスライダー">
  <div class="splide__track">
    <ul class="splide__list">
      <li class="splide__slide">
        <img src="https://pengi-n.co.jp/blog/wp-content/uploads/2024/01/splide-01.jpg"　alt="">
      </li>
      <li class="splide__slide">
        <img src="https://pengi-n.co.jp/blog/wp-content/uploads/2024/01/splide-02.jpg"　alt="">
      </li>
      <li class="splide__slide">
        <img src="https://pengi-n.co.jp/blog/wp-content/uploads/2024/01/splide-03.jpg"　alt="">
      </li>
    </ul>
  </div>
</div>

html, body {
  margin: 0;
  padding: 0;
}

.splide__slide {
  height: 300px;
}
.splide__slide img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

new Splide( '.splide' ).mount()