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CSS

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JavaScript

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HTML 

              
                 <main>
      <h1>Jared's Food</h1>
      <p>Click on an image to enlarge.</p>
   <p>
      <ul id="image_list">
        <li>
          <a href="https://shophomespice.com/images/ap_1.jpg" title="All Purpose Seasoning"
            ><img src="https://shophomespice.com/images/ap_1.jpg" alt="All Purpose Seasoning"
          /></a>
        </li>
        <li>
          <a href="https://shophomespice.com/images/bbq_1.jpg" title="BBQ Seasoning"
            ><img src="https://shophomespice.com/images/bbq_1.jpg" alt="BBQ Seasoning"
          /></a>
        </li>
        <li>
          <a href="https://shophomespice.com/images/card_1.jpg" title="Whole Cardomon"
            ><img src="https://shophomespice.com/images/card_1.jpg" alt="Whole Cardomon"
          /></a>
        </li>
        <li>
          <a href="https://shophomespice.com/images/uma_1.jpg" title="Umami Salt"
            ><img src="https://shophomespice.com/images/uma_1.jpg" alt="Umami Salt"
          /></a>
        </li>
        <li>
          <a href="https://shophomespice.com/images/red_1.jpg" title="Red Pepper Flakes"
            ><img src="https://shophomespice.com/images/red_1.jpg" alt="Red Pepper Flakes"
          /></a>
        </li>
      </ul>
   </p>
      <h2 id="caption"></h2>
      <p id="holder"><img src="" alt="" title="" id="main_image" /></p>
    </main>
!

CSS 

              
                main{
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  align-items: center;
}

ul{
  display: flex;
  justify-content: center;
}
li {

   list-style: none;
}
li img{
  width: 50%;
}
!

JS 

              
                onload = () => {
  // getElementById function
  const $ = (id) => {
    return document.getElementById(id);
  };

  // Variables
  const listNode = $("image_list"); // ul element
  const captionNode = $("caption"); //h2 element
  const imageNode = $("main_image"); //main img element
  const holder = $("holder"); // get 'p' element
  let imageLinks = listNode.getElementsByTagName("a"); //grabs the links in the ul list
  [...imageLinks].forEach((imgLink) => {
    let height = 300;
    let width = 325;
    //Create the larger images
    let image = new Image(width, height);
    // Get href attribute of each img from image list
    image.src = imgLink.getAttribute("href");
    image.title = imgLink.getAttribute("title");
    // When you click on a thumbnail, larger img will appear
    //Click again and image will switch to new one
    imgLink.onclick = (e) => {
      e.preventDefault();
      holder.removeChild(holder.firstChild);
      holder.appendChild(image);
      captionNode.textContent = image.title;
    }; //end event handler
  }); //end 'foreach'
};
!
999px

Console