Sådan kunne løsningen se ud, når du implementerer en karrusel fra W3 Schools i en “Tilpasset HTML” blok.

CSS, HTML & JavaScript

Herunder ser du indholdet i blokken "Tilpasset HTML":

<style>
    * {box-sizing: border-box}
    body {font-family: Verdana, sans-serif; margin:0}
    .mySlides {display: none}
    img {vertical-align: middle;}

    /* Slideshow container */
    .slideshow-container {
      max-width: 1000px;
      position: relative;
      margin: auto;
    }

    /* Next & previous buttons */
    .prev, .next {
      cursor: pointer;
      position: absolute;
      top: 50%;
      width: auto;
      padding: 16px;
      margin-top: -22px;
      color: white;
      font-weight: bold;
      font-size: 18px;
      transition: 0.6s ease;
      border-radius: 0 3px 3px 0;
      user-select: none;
    }

    /* Position the "next button" to the right */
    .next {
      right: 0;
      border-radius: 3px 0 0 3px;
    }

    /* On hover, add a black background color with a little bit see-through */
    .prev:hover, .next:hover {
      background-color: rgba(0,0,0,0.8);
    }

    /* Caption text */
    .text {
      color: #f2f2f2;
      font-size: 15px;
      padding: 8px 12px;
      position: absolute;
      bottom: 8px;
      width: 100%;
      text-align: center;
    }

    /* Number text (1/3 etc) */
    .numbertext {
      color: #f2f2f2;
      font-size: 12px;
      padding: 8px 12px;
      position: absolute;
      top: 0;
    }

    /* The dots/bullets/indicators */
    .dot {
      cursor: pointer;
      height: 15px;
      width: 15px;
      margin: 0 2px;
      background-color: #bbb;
      border-radius: 50%;
      display: inline-block;
      transition: background-color 0.6s ease;
    }

    .active, .dot:hover {
      background-color: #717171;
    }

    /* Fading animation */
    .fade {
      animation-name: fade;
      animation-duration: 1.5s;
    }

    @keyframes fade {
      from {opacity: .4}
      to {opacity: 1}
    }

    /* On smaller screens, decrease text size */
    @media only screen and (max-width: 300px) {
      .prev, .next,.text {font-size: 11px}
    }
    </style>
  <div>
    <div class="slideshow-container">

    <div class="mySlides fade">
      <div class="numbertext">1 / 3</div>
      <img src="https://multimusen.dk/wp-content/uploads/witch-edited.jpeg" style="width:100%">
      <div class="text">Caption Text</div>
    </div>

    <div class="mySlides fade">
      <div class="numbertext">2 / 3</div>
      <img src="https://multimusen.dk/wp-content/uploads/superwoman-coder-edited.jpeg" style="width:100%">
      <div class="text">Caption Two</div>
    </div>

    <div class="mySlides fade">
      <div class="numbertext">3 / 3</div>
      <img src="https://multimusen.dk/wp-content/uploads/hugin-munin-2.jpeg" style="width:100%">
      <div class="text">Caption Three</div>
    </div>

    <a class="prev" onclick="plusSlides(-1)">❮</a>
    <a class="next" onclick="plusSlides(1)">❯</a>

    </div>
    <br>

    <div style="text-align:center">
      <span class="dot" onclick="currentSlide(1)"></span>
      <span class="dot" onclick="currentSlide(2)"></span>
      <span class="dot" onclick="currentSlide(3)"></span>
    </div>
</div>

    <script>
    let slideIndex = 1;
    showSlides(slideIndex);

    function plusSlides(n) {
      showSlides(slideIndex += n);
    }

    function currentSlide(n) {
      showSlides(slideIndex = n);
    }

    function showSlides(n) {
      let i;
      let slides = document.getElementsByClassName("mySlides");
      let dots = document.getElementsByClassName("dot");
      if (n > slides.length) {slideIndex = 1}
      if (n < 1) {slideIndex = slides.length}
      for (i = 0; i < slides.length; i++) {
        slides[i].style.display = "none";
      }
      for (i = 0; i < dots.length; i++) {
        dots[i].className = dots[i].className.replace(" active", "");
      }
      slides[slideIndex-1].style.display = "block";
      dots[slideIndex-1].className += " active";
    }
    </script>

Kilde: https://www.w3schools.com/howto/tryit.asp?filename=tryhow_js_slideshow