<div class="slideshow-container">

<div class="mySlides fade">
  <div class="numbertext">1 / 3</div>
  <img src="https://upload.wikimedia.org/wikipedia/commons/1/1f/Purity_of_nature.jpg" style="width:100%">
  <div class="text">Caption Text</div>
</div>

<div class="mySlides fade">
  <div class="numbertext">2 / 3</div>
  <img src="https://mairie-balma.fr/wp-content/uploads/2016/06/Lhers.jpg" style="width:100%">
  <div class="text">Caption Two</div>
</div>

<div class="mySlides fade">
  <div class="numbertext">3 / 3</div>
  <img src="https://encrypted-tbn0.gstatic.com/images?q=tbn:ANd9GcRt-b1iBqHQ_emkm1wFmkM7KQskzIqg7YQPZWW85Sa7k2nNLwgjMw" style="width:100%">
  <div class="text">Caption Three</div>
</div>

<a class="prev" onclick="plusSlides(-1)">&#10094;</a>
<a class="next" onclick="plusSlides(1)">&#10095;</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>

.slideshow-container {
  max-width: 300px;
  position: relative;
  margin: auto;
}


.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;
}


.next {
  right: 0;
  border-radius: 3px 0 0 3px;
}


.prev:hover, .next:hover {
  background-color: rgba(0,0,0,0.8);
}


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


.numbertext {
  color: #f2f2f2;
  font-size: 12px;
  padding: 8px 12px;
  position: absolute;
  top: 0;
}


.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;
}

let slideIndex = 0;

function plusSlides(n) {
  slideIndex = (slideIndex + slides.length + n) % slides.length;
  showSlides();
}

function currentSlide(n) {
  slideIndex = n % slides.length;
  showSlides();
}

const slides = [...document.getElementsByClassName("mySlides")];
const dots = [...document.getElementsByClassName("dot")];

function showSlides() {
  slides.forEach((slide,i) => slide.style.display = i === slideIndex ? "block" : "none");
  dots.forEach((dot,i) => dot.classList[i === slideIndex ? "add" : "remove"]("active"));
}

setInterval(() => plusSlides(1), 3e3);
currentSlide(0);