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HTML

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About the <head>

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CSS

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CSS preprocessors help make authoring CSS easier. All of them offer things like variables and mixins to provide convenient abstractions.

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CSS Base

About CSS Base

It's a common practice to apply CSS to a page that styles elements such that they are consistent across all browsers. We offer two of the most popular choices: normalize.css and a reset. Or, choose Neither and nothing will be applied.

Vendor Prefixing

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JavaScript

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JavaScript preprocessors can help make authoring JavaScript easier and more convenient.

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Babel includes JSX processing.

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HTML 

              
                <link href="https://cdn.jsdelivr.net/npm/bootstrap@5.0.2/dist/css/bootstrap.min.css" rel="stylesheet" integrity="sha384-EVSTQN3/azprG1Anm3QDgpJLIm9Nao0Yz1ztcQTwFspd3yD65VohhpuuCOmLASjC" crossorigin="anonymous">

<link rel="stylesheet" href="https://pro.fontawesome.com/releases/v5.10.0/css/all.css" integrity="sha384-AYmEC3Yw5cVb3ZcuHtOA93w35dYTsvhLPVnYs9eStHfGJvOvKxVfELGroGkvsg+p" crossorigin="anonymous" />

<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/5.13.0/css/all.min.css" integrity="sha512-L7MWcK7FNPcwNqnLdZq86lTHYLdQqZaz5YcAgE+5cnGmlw8JT03QB2+oxL100UeB6RlzZLUxCGSS4/++mNZdxw==" crossorigin="anonymous" referrerpolicy="no-referrer" />

<section class="slider my-5">
  <div class="container">
    <div class="row gy-4">
      <div class="col-md-4">
        <div class="item position-relative">
          <div class="img-item">
            <img src="https://i1.sndcdn.com/artworks-YxGUGES6DrzzCUGx-Gx32ZQ-t240x240.jpg" alt="item photo" class="w-100">
          </div>
          <div class="content-item text-center p-2 bg-white position-absolute">
            <h4>item title</h4>
            <p>Lorem ipsum, dolor sit amet consectetur adipisicing.</p>
          </div>
        </div>
      </div>
      <div class="col-md-4">
        <div class="item position-relative">
          <div class="img-item">
            <img src="https://upload-assets.vice.com/files/2016/03/26/1459014592Basketball.png" alt="item photo" class="w-100">
          </div>
          <div class="content-item text-center p-2 bg-white position-absolute">
            <h4>item title</h4>
            <p>Lorem ipsum, dolor sit amet consectetur adipisicing.</p>
          </div>
        </div>
      </div>
      <div class="col-md-4">
        <div class="item position-relative">
          <div class="img-item">
            <img src="https://f4.bcbits.com/img/a2933723780_10.jpg" alt="item photo" class="w-100">
          </div>
          <div class="content-item text-center p-2 bg-white position-absolute">
            <h4>item title</h4>
            <p>Lorem ipsum, dolor sit amet consectetur adipisicing.</p>
          </div>
        </div>
      </div>
      <div class="col-md-4 ">
        <div class="item position-relative">
          <div class="img-item">
            <img src="https://inspgr.id/app/uploads/2016/03/3d-grand-chamaco-08.jpg" alt="item photo" class="w-100">
          </div>
          <div class="content-item text-center p-2 bg-white position-absolute">
            <h4>item title</h4>
            <p>Lorem ipsum, dolor sit amet consectetur adipisicing.</p>
          </div>
        </div>
      </div>
      <div class="col-md-4 ">
        <div class="item position-relative">
          <div class="img-item">
            <img src="https://images.squarespace-cdn.com/content/v1/53b208ace4b0dc3e7be6ec30/1515709148266-LIUT0GA35774NMFJG036/ke17ZwdGBToddI8pDm48kBtpJ0h6oTA_T7DonTC8zFdZw-zPPgdn4jUwVcJE1ZvWQUxwkmyExglNqGp0IvTJZamWLI2zvYWH8K3-s_4yszcp2ryTI0HqTOaaUohrI8PIWkiAYz5ghgEgSGJuDQ4e1ZKXpRdhEMT7SgthRpD0vyIKMshLAGzx4R3EDFOm1kBS/H20Bounce.jpg" alt="item photo" class="w-100">
          </div>
          <div class="content-item text-center p-2 bg-white position-absolute">
            <h4>item title</h4>
            <p>Lorem ipsum, dolor sit amet consectetur adipisicing.</p>
          </div>
        </div>
      </div>
      <div class="col-md-4 ">
        <div class="item position-relative">
          <div class="img-item">
            <img src="https://www.webdesignertrends.com/wp-content/uploads/2015/01/el-grand-chamacon-24.jpg" alt="item photo" class="w-100">
          </div>
          <div class="content-item text-center p-2 bg-white position-absolute">
            <h4>item title</h4>
            <p>Lorem ipsum, dolor sit amet consectetur adipisicing.</p>
          </div>
        </div>
      </div>
    </div>
  </div>
  <div class="modal-layer position-fixed justify-content-center align-items-center">
    <div class="slide-img w-75 h-75 d-flex align-items-center justify-content-between px-4 position-relative">
      <i id="closeBtn" class="far fa-times-circle fa-2x position-absolute end-0 top-0 m-4"></i>
      <i id="prev" class="fas fa-chevron-left fa-2x"></i>
      <i id="next" class="fas fa-chevron-right fa-2x"></i>
    </div>
  </div>
</section>

<script src="https://cdn.jsdelivr.net/npm/bootstrap@5.0.2/dist/js/bootstrap.bundle.min.js" integrity="sha384-MrcW6ZMFYlzcLA8Nl+NtUVF0sA7MsXsP1UyJoMp4YLEuNSfAP+JcXn/tWtIaxVXM" crossorigin="anonymous"></script>
!

CSS 

              
                section .content-item {
  width: 80%;
  left: 10%;
  bottom: 10%;
}
section .modal-layer {
  inset: 0;
  background: rgba(0, 0, 0, 0.6);
  display: none;
}
section .modal-layer .slide-img {
  background-image: url(https://i1.sndcdn.com/artworks-YxGUGES6DrzzCUGx-Gx32ZQ-t240x240.jpg);
  background-size: cover;
  background-position: 50% 50%;
  background-repeat: no-repeat;
}
!

JS 

              
                // variables
// items & images
let itemsImgs = document.querySelectorAll(".img-item img");
itemsImgsArr = Array.from(itemsImgs);

// pop slider
let popSlider = document.querySelector("section .modal-layer");
let bgSlide = document.querySelector(".modal-layer .slide-img");

// icons/buttons
// close
let closeBtn = document.querySelector("#closeBtn");
closeBtn.style.cssText = `cursor : pointer;`;
// left
let prevBtn = document.querySelector("#prev");
prevBtn.style.cssText = `cursor : pointer;`;
// right
let nextBtn = document.querySelector("#next");
nextBtn.style.cssText = `cursor : pointer;`;

// index of item
let activeIndex;

for (let i = 0; i < itemsImgs.length; i++) {
  itemsImgs[i].addEventListener("click", function (e) {
    popSlider.style.display = "flex";
    let activeSrc = e.target.src;
    bgSlide.style.backgroundImage = `url(${activeSrc})`;
    activeIndex = itemsImgsArr.indexOf(e.target);
  });
}

closeBtn.addEventListener("click", removeSlider);

function removeSlider() {
  popSlider.style.display = "none";
}

nextBtn.addEventListener("click", nextSlider);

function nextSlider() {
  activeIndex++;
  if (activeIndex == itemsImgs.length) {
    activeIndex = 0;
  }
  let imgSrc = itemsImgsArr[activeIndex].src;
  bgSlide.style.backgroundImage = `url(${imgSrc})`;
}

prevBtn.addEventListener("click", prevSlider);

function prevSlider() {
  activeIndex--;
  if (activeIndex < 0) {
    activeIndex = itemsImgs.length - 1;
  }
  let imgSrc = itemsImgsArr[activeIndex].src;
  bgSlide.style.backgroundImage = `url(${imgSrc})`;
}

// keyboard events
document.addEventListener("keydown", function (e) {
  if (e.key == "Escape") {
    removeSlider();
  } else if (e.key == "ArrowRight") {
    nextSlider();
  } else if (e.key == "ArrowLeft") {
    prevSlider();
  }
});
!
999px

Console