<section class="intro">
      <div class="left">
        <div>
          <span>Explore</span>
          <h1>The Places Where You Will</h1>
          <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Eos eveniet amet excepturi voluptates dolorem totam ad quod hic, porro accusamus, repellat, corrupti at obcaecati ducimus, dolor quibusdam sequi nemo inventore?</p>
          <a href="https://unsplash.com/" target="_blank">Images by Unsplash</a>
        </div>
      </div>

      <div class="slider">
        <ul>
          <li style="background-image:url(https://images.unsplash.com/photo-1458640904116-093b74971de9?crop=entropy&fit=crop&fm=jpg&h=675&ixjsv=2.1.0&ixlib=rb-0.3.5&q=80&w=1375)">
            <div class="center-y">
              <h3>Slider Title #1</h3>
              <a href="#">View Project</a>  
            </div>
          </li>
          <li style="background-image:url(https://images.unsplash.com/photo-1451906278231-17b8ff0a8880?crop=entropy&fit=crop&fm=jpg&h=675&ixjsv=2.1.0&ixlib=rb-0.3.5&q=80&w=1375)">
            <div class="center-y">
              <h3>Slider Title #2</h3>
              <a href="#">View Project</a>  
            </div>
          </li>
          <li style="background-image:url(https://images.unsplash.com/photo-1456428199391-a3b1cb5e93ab?crop=entropy&fit=crop&fm=jpg&h=675&ixjsv=2.1.0&ixlib=rb-0.3.5&q=80&w=1375)">
            <div class="center-y">
              <h3>Slider Title #3</h3>
              <a href="#">View Project</a>  
            </div>
          </li>
        </ul>

        <ul>
          <nav>
            <a href="#"></a>
            <a href="#"></a>
            <a href="#"></a>
          </nav>
        </ul>
      </div>
  </section>

@import url(https://fonts.googleapis.com/css?family=Playfair+Display:400,400italic);
* {
  box-sizing: border-box;
  padding: 0;
  margin: 0;
}
html {
  font-size: calc(5px + 0.4vw);
}
body {
  font-family: 'Playfair Display', serif;
}
a {
  text-decoration: none;
}
.intro {
  position: relative;
  width: 100%;
  height: 100vh;
}
.left {
  float: left;
  height: 100%;
  width: 60%;
  padding: 3rem 3rem 3rem 5rem;
  display: table;
}
.left > div {
  display: table-cell;
  vertical-align: middle;
}
span {
  color: #E8CA2B;
  font-size: 14px;
  font-weight: bold;
  letter-spacing: 2px;
  display: inline-block;
  text-transform: uppercase;
  font-family: sans-serif;
  margin-bottom: 4rem;
}
h1 {
  font-size: 8rem;
  margin-bottom: 3rem;
}
h1 + p {
  color: #949494;
  font-size: 1.6rem;
  margin-bottom: 4rem;
}
p + a {
  font-size: 1.6rem;
  color: #000;
}
.slider {
  float: right;
  position: relative;
  width: 40%;
  height: 100%;
}
.slider li {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-size: cover;
  background-repeat: no-repeat;
  background-position: 50% 50%;
  transition: clip .7s ease-in-out, z-index 0s .7s;
  clip: rect(0, 100vw, 100vh, 100vw);
  display: table;
}
.center-y {
  display: table-cell;
  vertical-align: middle;
  text-align: center;
  color: #fff;
}
h3 {
  font-size: 5rem;
  font-style: italic;
}
h3 + a {
  font-size: 1.6rem;
  display: inline-block;
  color: #fff;
  margin-top: 2rem;
}
h3, h3 + a {
  opacity: 0;
  transition: opacity .7s 0s, transform .5s .2s;
  transform: translate3d(0, 50%, 0);
}
li.current h3, li.current h3 + a {
  opacity: 1;
  transition-delay: 1s;
  transform: translate3d(0, 0, 0);
}
li.current {
  z-index: 1;
  clip: rect(0, 100vw, 100vh, 0);
}
li.prev {
  clip: rect(0, 0, 100vh, 0);
}
.slider nav {
  position: absolute;
  bottom: 5%;
  left: 0;
  right: 0;
  text-align: center;
  z-index: 10;
}
nav a {
  display: inline-block;
  border-radius: 50%;
  width: 1.2rem;
  height: 1.2rem;
  min-width: 12px;
  min-height: 12px;
  background: #fff;
  margin: 0 1rem;
  transition: transform .3s;
}
a.current_dot {
  transform: scale(1.4);
}
@media screen and (max-width: 700px) {
  .left {
    width: 100%;
    height: 30%;
  }
  .slider {
    width: 100%;
    height: 70%;
  }
}

{
  class SliderClip {
    constructor(el) {
      this.el = el;
      this.Slides = Array.from(this.el.querySelectorAll('li'));
      this.Nav = Array.from(this.el.querySelectorAll('nav a'));
      this.totalSlides = this.Slides.length;
      this.current = 0;
      this.autoPlay = true; //true or false
      this.timeTrans = 4000; //transition time in milliseconds
      this.IndexElements = [];

      for(let i=0;i<this.totalSlides;i++) {
        this.IndexElements.push(i);
      }

      this.setCurret();
      this.initEvents();
    }
    setCurret() {
      this.Slides[this.current].classList.add('current');
      this.Nav[this.current].classList.add('current_dot');
    }
    initEvents() {
      const self = this;

      this.Nav.forEach((dot) => {
        dot.addEventListener('click', (ele) => {
          ele.preventDefault();
          this.changeSlide(this.Nav.indexOf(dot));
        })
      })

      this.el.addEventListener('mouseenter', () => self.autoPlay = false);
      this.el.addEventListener('mouseleave', () => self.autoPlay = true);

      setInterval(function() {
        if (self.autoPlay) {
          self.current = self.current < self.Slides.length-1 ? self.current + 1 : 0;
          self.changeSlide(self.current);
        }
      }, this.timeTrans);

    }
    changeSlide(index) {

      this.Nav.forEach((allDot) => allDot.classList.remove('current_dot'));

      this.Slides.forEach((allSlides) => allSlides.classList.remove('prev', 'current'));

      const getAllPrev = value => value < index;

      const prevElements = this.IndexElements.filter(getAllPrev);

      prevElements.forEach((indexPrevEle) => this.Slides[indexPrevEle].classList.add('prev'));

      this.Slides[index].classList.add('current');
      this.Nav[index].classList.add('current_dot');
    }
  }

  const slider = new SliderClip(document.querySelector('.slider'));
}