try this code option 1:
it is working for me.
<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="width=device-width, initial-scale=1">
<style>
* {box-sizing:border-box}
body {font-family: Verdana,sans-serif;margin:0}
.mySlides {display:none; width: 100%;}
/* Slideshow container */
.slideshow { /*NOT 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;
}
/* 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: 13px;
width: 13px;
margin: 0 2px;
background-color: #bbb;
border-radius: 50%;
display: inline-block;
transition: background-color 0.6s ease;
}
.active, .dot:hover {
background-color: #f44336;
}
/* Fading animation */
.fade {
-webkit-animation-name: fade;
-webkit-animation-duration: 1.5s;
animation-name: fade;
animation-duration: 1.5s;
}
@-webkit-keyframes fade {
from {opacity: .4}
to {opacity: 1}
}
@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>
</head>
<body>
<div id="wrapper">
<div class="slideshow w3-container w3-half">
<div class="w3-content w3-display-container">
<img class="mySlides fade" src="https://www.w3schools.com/howto/img_nature_wide.jpg">
<img class="mySlides fade" src="https://www.w3schools.com/howto/img_fjords_wide.jpg">
<a class="prev" onclick="plusDivs(-1, 0)">❮</a>
<a class="next" onclick="plusDivs(1, 0)">❯</a>
<!-- Extra plusDivs parameter refers to first (0) slideshow (start from 0) -->
</div>
<br>
<div style="text-align:center">
<span class="dot" onclick="currentDiv(1, 0)"></span>
<span class="dot" onclick="currentDiv(2, 0)"></span>
</div>
</div>
<hr>
<div class="slideshow w3-container w3-half">
<div class="w3-content w3-display-container">
<img class="mySlides fade" src="https://www.w3schools.com/howto/img_nature_wide.jpg">
<img class="mySlides fade" src="https://www.w3schools.com/howto/img_fjords_wide.jpg">
<a class="prev" onclick="plusDivs(-1, 1)">❮</a>
<a class="next" onclick="plusDivs(1, 1)">❯</a>
<!-- Extra plusDivs parameter refers to second (1) slideshow (start from 0) -->
</div>
<br>
<div style="text-align:center">
<span class="dot" onclick="currentDiv(1, 1)"></span>
<span class="dot" onclick="currentDiv(2, 1)"></span>
</div>
</div>
<hr>
<div class="slideshow w3-container w3-half">
<div class="w3-content w3-display-container">
<img class="mySlides fade" src="https://www.w3schools.com/howto/img_nature_wide.jpg">
<img class="mySlides fade" src="https://www.w3schools.com/howto/img_fjords_wide.jpg">
<a class="prev" onclick="plusDivs(-1, 2)">❮</a>
<a class="next" onclick="plusDivs(1, 2)">❯</a>
<!-- Extra plusDivs parameter refers to second (1) slideshow (start from 0) -->
</div>
<br>
<div style="text-align:center">
<span class="dot" onclick="currentDiv(1, 2)"></span>
<span class="dot" onclick="currentDiv(2, 2)"></span>
</div>
</div>
<hr>
<script>
var slideIndex = 1;
var z = document.getElementsByClassName("slideshow");
for (i = 0; i < z.length; i++) {
//set custom data attribute to first current image index
z[i].setAttribute("data-currentslide", 1);
showDivs(z[i].getAttribute("data-currentslide"), i);
}
function plusDivs(n, j) {
//get custom data attribute value of current image index to slideshow class index j
slideIndex = parseInt(z[j].getAttribute("data-currentslide"));
showDivs(slideIndex += n, j);
}
function currentDiv(n, j) {
showDivs(slideIndex = n, j); /* showDivs Not showSlides*/
}
function showDivs(n, j) {
var i;
var z = document.getElementsByClassName("slideshow")[j];
var x = z.getElementsByClassName("mySlides");
var dots = z.getElementsByClassName("dot");
if (n > x.length) {
slideIndex = 1
}
if (n < 1) {
slideIndex = x.length;
}
//set custom data attribute to current image index
z.setAttribute("data-currentslide", slideIndex);
for (i = 0; i < x.length; i++) {
x[i].style.display = "none";
}
for (i = 0; i < dots.length; i++) {
dots[i].className = dots[i].className.replace(" active", "");
}
x[slideIndex - 1].style.display = "block";
dots[slideIndex - 1].className += " active";
}
</script>
</div>
</body>
</html>
