Add a clickable image over Slideshow

#1. First, find the ID of the Slideshow.

In my example, we have:

section[data-section-id="668ce9ead5f66752bfbf53cb"]

#2. Use this code to Code Injection > Footer or Page Header Injection

<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.7.0/jquery.min.js"></script>
<script>
$(document).ready(function() {
  $('<a href="https://amazon.com" target="_blank" class="custom-img"><img src="https://static1.squarespace.com/static/665a652de576867a26021080/t/66694e042671fd57abfd39bd/1718177284242/sheila+02.png"/>').appendTo('section[data-section-id="668ce9ead5f66752bfbf53cb"] .gallery-fullscreen-slideshow-list');
  });
</script>
<style>
div.gallery-fullscreen-slideshow-list .custom-img {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%,-50%);
    width: 100%;
    z-index: 999999;
    text-align: center;
}
div.gallery-fullscreen-slideshow-list .custom-img img {
    width: 150px;
}
</style>

Result: