<!DOCTYPE html>
<!--Codingthai.com--> 
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/5.15.1/css/all.min.css" />
    <link rel="stylesheet" href="style.css" />
    <title>Vertical Slider</title>
  </head>
  <body>
    <div class="slider-container">
      <div class="left-slide">
        <div style="background-color: #FD3555">
          <h1>Nature flower</h1>
          <p>all in pink</p>
        </div>
        <div style="background-color: #2A86BA">
          <h1>Bluuue Sky</h1>
          <p>with it's mountains</p>
        </div>
        <div style="background-color: #252E33">
          <h1>Lonely castle</h1>
          <p>in the wilderness</p>
        </div>
        <div style="background-color: #FFB866">
          <h1>Flying eagle</h1>
          <p>in the sunset</p>
        </div>
      </div>
      <div class="right-slide">
        <div style="background-image: url('https://images.unsplash.com/photo-1508768787810-6adc1f613514?ixlib=rb-0.3.5&ixid=eyJhcHBfaWQiOjEyMDd9&s=e27f6661df21ed17ab5355b28af8df4e&auto=format&fit=crop&w=1350&q=80')"></div>
        <div style="background-image: url('https://images.unsplash.com/photo-1519981593452-666cf05569a9?ixlib=rb-0.3.5&ixid=eyJhcHBfaWQiOjEyMDd9&s=90ed8055f06493290dad8da9584a13f7&auto=format&fit=crop&w=715&q=80')"></div>
        <div style="background-image: url('https://images.unsplash.com/photo-1486899430790-61dbf6f6d98b?ixlib=rb-0.3.5&ixid=eyJhcHBfaWQiOjEyMDd9&s=8ecdee5d1b3ed78ff16053b0227874a2&auto=format&fit=crop&w=1002&q=80')"></div>
        <div style="background-image: url('https://images.unsplash.com/photo-1510942201312-84e7962f6dbb?ixlib=rb-0.3.5&ixid=eyJhcHBfaWQiOjEyMDd9&s=da4ca7a78004349f1b63f257e50e4360&auto=format&fit=crop&w=1050&q=80')"></div>
      </div>
      <div class="action-buttons">
        <button class="down-button">
          <i class="fas fa-arrow-down"></i>
        </button>
        <button class="up-button">
          <i class="fas fa-arrow-up"></i>
        </button>
      </div>
    </div>

    <script src="script.js"></script>
  </body>
</html>
@import url('https://fonts.googleapis.com/css?family=Open+Sans');

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: 'Open Sans', sans-serif;
  height: 100vh;
}

.slider-container {
  position: relative;
  overflow: hidden;
  width: 100vw;
  height: 100vh;
}

.left-slide {
  height: 100%;
  width: 35%;
  position: absolute;
  top: 0;
  left: 0;
  transition: transform 0.5s ease-in-out;
}

.left-slide > div {
  height: 100%;
  width: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  color: #fff;
}

.left-slide h1 {
  font-size: 40px;
  margin-bottom: 10px;
  margin-top: -30px;
}

.right-slide {
  height: 100%;
  position: absolute;
  top: 0;
  left: 35%;
  width: 65%;
  transition: transform 0.5s ease-in-out;
}

.right-slide > div {
  background-repeat: no-repeat;
  background-size: cover;
  background-position: center center;
  height: 100%;
  width: 100%;
}

button {
  background-color: #fff;
  border: none;
  color: #aaa;
  cursor: pointer;
  font-size: 16px;
  padding: 15px;
}

button:hover {
  color: #222;
}

button:focus {
  outline: none;
}

.slider-container .action-buttons button {
  position: absolute;
  left: 35%;
  top: 50%;
  z-index: 100;
}

.slider-container .action-buttons .down-button {
  transform: translateX(-100%);
  border-top-left-radius: 5px;
  border-bottom-left-radius: 5px;
}

.slider-container .action-buttons .up-button {
  transform: translateY(-100%);
  border-top-right-radius: 5px;
  border-bottom-right-radius: 5px;
}
const sliderContainer = document.querySelector('.slider-container')
const slideRight = document.querySelector('.right-slide')
const slideLeft = document.querySelector('.left-slide')
const upButton = document.querySelector('.up-button')
const downButton = document.querySelector('.down-button')
const slidesLength = slideRight.querySelectorAll('div').length

let activeSlideIndex = 0

slideLeft.style.top = `-${(slidesLength - 1) * 100}vh`

upButton.addEventListener('click', () => changeSlide('up'))
downButton.addEventListener('click', () => changeSlide('down'))

const changeSlide = (direction) => {
    const sliderHeight = sliderContainer.clientHeight
    if(direction === 'up') {
        activeSlideIndex++
        if(activeSlideIndex > slidesLength - 1) {
            activeSlideIndex = 0
        }
    } else if(direction === 'down') {
        activeSlideIndex--
        if(activeSlideIndex < 0) {
            activeSlideIndex = slidesLength - 1
        }
    }

    slideRight.style.transform = `translateY(-${activeSlideIndex * sliderHeight}px)`
    slideLeft.style.transform = `translateY(${activeSlideIndex * sliderHeight}px)`
}
Run Pen

External CSS

This Pen doesn't use any external CSS resources.

External JavaScript

This Pen doesn't use any external JavaScript resources.