<h2>Image slider</h2>
    <div class="slider">
      <div class="slide">
            <img src="https://images.unsplash.com/photo-1454496522488-7a8e488e8606?ixlib=rb-1.2.1&ixid=MnwxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHx8&auto=format&fit=crop&w=876&q=80" alt="Photo1"/>
        </div>
      <div class="slide">
            <img src="https://images.unsplash.com/photo-1619266465172-02a857c3556d?ixlib=rb-1.2.1&ixid=MnwxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHx8&auto=format&fit=crop&w=1031&q=80" alt="Photo3"/>
        </div> 
      <div class="slide">
            <img src="https://images.unsplash.com/photo-1454496522488-7a8e488e8606?ixlib=rb-1.2.1&ixid=MnwxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHx8&auto=format&fit=crop&w=876&q=80" alt="Photo2"/>
        </div>
      <div class="slide">
            <img src="https://images.unsplash.com/photo-1454496522488-7a8e488e8606?ixlib=rb-1.2.1&ixid=MnwxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHx8&auto=format&fit=crop&w=876&q=80" alt="Photo3"/>
        </div> 

        <button class="btn-slide prev"><i class="fas fa-3x fa-chevron-circle-left"></i></button>
        <button class="btn-slide next"><i class="fas fa-3x fa-chevron-circle-right"></i></button>
      
    </div>
    <div class="dots-container">
            <span class="dot active" data-slide="0"></span>
            <span class="dot" data-slide="1"></span>
            <span class="dot" data-slide="2"></span>
      <span class="dot" data-slide="3"></span>
    </div>

* {
  margin: 0;
  padding: 0;
  box-sizing: inherit;
}
html {
  font-size: 1rem;
  box-sizing: border-box;
}
body {
  width: 100%;
  height: 100%;
  color: #272727;
  line-height: 1.9;
  background-color: #f7f5f5;
  font-family:Arial, Helvetica, sans-serif;
}
h2{
    text-align: center;
    font-size: 2rem;
    line-height: 3.5;
}
.slider{
    position: relative;
     max-width: 40rem; 
    height: 26.625rem; 
    margin: 0 auto;
    overflow: hidden;
}
.slide{ 
    position: absolute;
    top:0;
    width: 100%;
    height: 26.625rem;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: transform 1s;
}
.slide > img{
    width: 100%;
    height: 100%;
    object-fit: cover;
}
button{
    background: none;
    border: none;
}
button .fas{
    color: rgba(255, 255, 255, .5);
}
.btn-slide{
    position:absolute;
    top:50%;
    z-index: 10;

    height: 5.5rem;
    width: 5.5rem;
    cursor: pointer;
}
.prev{
    left:3rem;
    transform: translate(-50%, -50%);
}
.next{
    right: 3rem;
    transform: translate(50%, -50%); 
}
.dots-container{
  display: flex;
  justify-content: center;
  align-items: center;
  position: relative;
}
.dot{
    width: 25px;
    height: 5px;
    margin: 15px 5px;
    border-radius: .5rem;
    background: rgba(39,39,39, .5);
    cursor: pointer;
}
.dot.active{
background:#272727;
}

function Slider() {
    const carouselSlides = document.querySelectorAll('.slide');
    const btnPrev = document.querySelector('.prev');
    const btnNext = document.querySelector('.next');
    const dotsSlide = document.querySelector('.dots-container');
    let currentSlide = 0;
  
    const activeDot = function (slide) {
        document.querySelectorAll('.dot').forEach(dot => dot.classList.remove('active'));
        document.querySelector(`.dot[data-slide="${slide}"]`).classList.add('active');
    };
    activeDot(currentSlide);

    const changeSlide = function (slides) {
        carouselSlides.forEach((slide, index) => (slide.style.transform = `translateX(${100 * (index - slides)}%)`));
    };
    changeSlide(currentSlide);

    btnNext.addEventListener('click', function () {
        currentSlide++; 
        if (carouselSlides.length - 1 < currentSlide) {
            currentSlide = 0;
        };
        changeSlide(currentSlide);
        activeDot(currentSlide);
});
    btnPrev.addEventListener('click', function () {
        currentSlide--;
        if (0 >= currentSlide) {
            currentSlide = 0;
        }; 
        changeSlide(currentSlide);
        activeDot(currentSlide);
    });

    dotsSlide.addEventListener('click', function (e) {
        if (e.target.classList.contains('dot')) {
            const slide = e.target.dataset.slide;
            changeSlide(slide);
            activeDot(slide);
        }
    });
  };
Slider();