change JS Solution

index.html

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.6.0/jquery.min.js" integrity="sha512-894YE6QWD5I59HgZOGReFYm4dnWc1Qt5NtvYSaNcOP+u1T9qYdvdihz0PPSiiqn/+/3e7Jo4EaG7TubfWGUrMQ==" crossorigin="anonymous" referrerpolicy="no-referrer"></script>
<script src="javascript.js"></script>

javascript.js

jQuery(document).ready(function( $ ){

var content = `<div id='empirePopup' class='modal'>
<div class='modal-content'>
    <span class='close'>×</span>
    <div id='empireContent'>
        <h2><i>Introducing DeKalb by Empire Office</i></h2>
        <h4>Leading Commercial Furniture & Interior Solutions Provider Empire Office Has Acquired DeKalb Office.</h4>
        <p>Bringing increased resources, proven insights and an enhanced range of services to provide an even greater level of support for our clients in Atlanta, Birmingham, and beyond.</p>
        <h5>Learn More:</h5>
        <div class="button-bar">
            <div><a href="https://www.empireoffice.com/announcing-empire-offices-acquisition-of-dekalb-office/">Read the Press Release</a></div>
            <div><a href="https://www.empireoffice.com/">Go to empireoffice.com</a></div>
            <div><a href="https://www.empireoffice.com/subscriber">Subscribe to Stay Informed</a></div>
        </div>
    </div>
</div>
</div><style>
@import url("css/austinfontface.css");

h2, h4, p, h5 {
    text-align:  center;
}

h2 {
    font-family: 'Austin-SemiboldItalic';
    color:  #3064AA;
    font-weight:  600;
    padding-bottom: 35px;
}

h4 {
    font-size:  20px;
    font-weight:  bold;
    padding-bottom:  35px;
    max-width:  500px;
    margin:  0 auto;
}

h5 {
    text-transform:  uppercase;
    font-size:  16px;
    font-weight:  bold;
    padding-bottom:  35px;
    letter-spacing: 6px;
}

p {
    padding-bottom:  25px;
    max-width:  500px;
    margin:  0 auto;
}

.button-bar {
    display:  flex;
    gap: 10px;
    flex-direction: row;
      align-items: center;
      justify-content: center;
}

.button-bar div {
    color:  white;
    text-transform:  uppercase;
    background-color:  black;
    padding: 15px 20px;
    text-align: center;
    line-height: 1;
}

.button-bar div a {
    color:  white;
    text-align:  center;
    letter-spacing: 6px;
    font-size: 12px;
    line-height: 1.25;
    font-weight:600;
}

@media (max-width: 800px) {
  .button-bar {
    flex-direction: column;
  }
}

.modal {
  display: none; /* Hidden by default */
  position: fixed; /* Stay in place */
  z-index: 999; /* Sit on top */
  left: 0;
  top: 0;
  width: 100%; /* Full width */
  height: 100%; /* Full height */
  overflow: auto; /* Enable scroll if needed */
  background-color: rgb(0,0,0); /* Fallback color */
  background-color: rgba(0,0,0,0.4); /* Black w/ opacity */
}

/* Modal Content/Box */
.modal-content {
  background-color: #fefefe;
  margin: 15% auto; /* 15% from the top and centered */
  padding: 20px;
  border: 1px solid #888;
  width: 50%; /* Could be more or less, depending on screen size */
  min-width: 400px;
  max-width:  768px;
  width: 100%;
}

/* The Close Button */
.close {
  color: #aaa;
  float: right;
  font-size: 28px;
  font-weight: bold;
}

.close:hover,
.close:focus {
  color: black;
  text-decoration: none;
  cursor: pointer;
}
</style>`;;


$(document.body).append(content);
$("#empirePopup").show();
var modal = document.getElementById("empirePopup");
var span = document.getElementsByClassName("close")[0];
span.onclick = function() {
modal.style.display = "none";
}
// When the user clicks anywhere outside of the modal, close it
window.onclick = function(event) {
if (event.target == modal) {
modal.style.display = "none";
}
}

});