Js carousel from w3schools

by Megi93

HTML

<div class="slideshow-container">
    <div class="mySlides fade">
        <div class="numbertext">1 / 3</div>
        <img src="https://www.w3schools.com/howto/img_nature_wide.jpg" style="width:100%">
        <div class="text">Caption Text</div>
    </div>

    <div class="mySlides fade" style="display:none;">
        <div class="numbertext">2 / 3</div>
        <img src="https://www.w3schools.com/howto/img_fjords_wide.jpg" style="width:100%">
        <div class="text">Caption Two</div>
    </div>

    <div class="mySlides fade" style="display:none;">
        <div class="numbertext">3 / 3</div>
        <img src="https://www.w3schools.com/howto/img_mountains_wide.jpg" 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>

CSS

* {
    box-sizing: border-box
}

body {
    font-family: Verdana, sans-serif;
    margin: 0
}


/* 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;
}


/* 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: #717171;
}


/* 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
    }
}

JavaScript

var slideIndex = 1;
showSlides(slideIndex);

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

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

function showSlides(n) {
    var i;
    var slides = document.getElementsByClassName("mySlides");
    var 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";
}