JSFiddle - React, Tailwind, and code Playground

HTML

<meta name="viewport" content="width=device-width, initial-scale=1.0"><br style="display: none">
<style>
  #outer {
    width: 50%;
    margin: auto;
  }

  #header {
    width: 100%;
    margin-bottom: 5px;
    padding-bottom: 0px;
  }

  .image {
    max-width: 100%;
  }

  .carimage {
    display: block;
    margin: 5px auto;
    width: 200px;
  }

  .block {
    border: 2px solid #0985e7;
    margin-bottom: 4px;
  }

  .buy-button {
    width: 100%;
    height: 75px;
    font-size: 24px;
    font-family: serif;
    font-weight: bold;
    color: white;
    background-color: #0985e7;
    display: none;
  }

  .buy-button:hover {
    width: 100%;
    height: 75px;
    font-size: 24px;
    font-family: serif;
    font-weight: bold;
    color: white;
    background-color: #0985e7;
    cursor: pointer;
  }

  .listing {
    margin: 10px;
    padding: 0px;
    font-family: serif;
  }

  .paragraph {
    padding: 0px;
    margin: 10px;
    font-family: serif;
  }

  #promotion {
    background-color: #0985e7;
    color: white;
  }

  #farts {
    display: block;
    text-align: center;
    font-family: monospace;
  }

  @media screen and (max-width: 850px) {
    #outer {
      width: 100%;
    }
  }

  /*

</style>
<div id="outer"><img class="image" id="header" src="https://i.ebayimg.com/00/s/MzYwWDE2MDA=/z/0f0AAOSwFnxbvA0X/$_45.PNG">
  <div class="block" id="part">
    <h2 class="listing">Really long ebay title that is really quite long</h2>
    <p class="paragraph"> This is a quality OEM part. See pictures for details on condition. </p>
  </div><a class="buy-link" href="#" target="_blank"> <button class="block buy-button"> Buy Now! </button> </a>
  <div class="block" id="car">
    <h2 class="listing">Donor Vehicle</h2>
    <ul>
      <li>2005 Volvo XC90 2.5L 5C</li>
      <li>212,082 miles</li>
      <li>Color Code: 467</li>
      <li>Interior code: A981</li>
      <li>VIN: YV1CY592X51153164</li>
      <li>Condition: Blown engine, no lights on dashboard.</li>
   ...

JavaScript

var itemId = document.getElementById('descItemNumber').innerHTML
  //itemId='332879702286'
  var links = document.getElementsByClassName('buy-link')
  var link1 = 'https://offer.ebay.com/ws/eBayISAPI.dll?BinConfirm&rev=0&fromPage=2047675&item='
  var link2 = '&quantity=1&fb=1'
  for (var i = 0; i < links.length; i++) {
    links[i].href = link1 + itemId + link2
  }