W3Schools Tryit Editor

<!DOCTYPE html>
<html>
<title>W3.CSS</title>
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="stylesheet" href="https:/edu/w3css/5/w3.css">
<style>
.mySlides {display:none;}
</style>
<body class="w3-container">

<h2>Slideshow Caption</h2>
<p>Add a caption text for each image slide with one of the <b>w3-display</b> classes (topleft, topmiddle, topright, bottomleft, bottommiddle, bottomright or middle).</p>

<div class="w3-display-container mySlides">
  <img src="img_snowtops.jpg" style="width:100%">
  <div class="w3-display-bottomleft w3-large w3-container w3-padding-16 w3-black">
    French Alps
  </div>
</div>
<div class="w3-display-container mySlides">
  <img src="img_lights.jpg" style="width:100%">
  <div class="w3-display-bottomright w3-large w3-container w3-padding-16 w3-black">Northern Lights
  </div>
</div>

<div class="w3-display-container mySlides">
  <img src="img_mountains.jpg" style="width:100%">
  <div class="w3-display-topleft w3-large w3-container w3-padding-16 w3-black">Beautiful Mountains
  </div>
</div>

<div class="w3-display-container mySlides">
  <img src="img_forest.jpg" style="width:100%">
  <div class="w3-display-topright w3-large w3-container w3-padding-16 w3-black">The Rain Forest
  </div>
</div>

<div class="w3-display-container mySlides">
  <img src="img_mountains.jpg" style="width:100%">
  <div class="w3-display-middle w3-large w3-container w3-padding-16 w3-black">Mountains!
  </div>
</div>

</div>

function plusDivs(n) {
  showDivs(slideIndex += n);
}

function showDivs(n) {
  const slides = document.querySelectorAll(".mySlides");

if (n > slides.length) {slideIndex = 1}
  if (n < 1) {slideIndex = slides.length}

slides.forEach(slide => {
    slide.style.display = "none";
  });

slides[slideIndex - 1].style.display = "block";
}
</script>

</body>
</html>