How can I add a second horizontal scrollbar to an image in Lightbox?

I’m trying to add a second horizontal scrollbar to the popup image generated by Lightbox. I know that scrollbars are not the way Lightbox is intended to be used; the image in Lightbox is traditionally constrained by the window size. But, scrollbars are what the client wants, and right now, there is one scrollbar on the bottom of the image, and I want to add a second scrollbar at the top of the image.

In my jsfiddle https://jsfiddle.net/mrgfvwd1/1/ the popup image has a scrollbar at the bottom (of course, we ignore the horizontal and vertical scrollbars added by jsfiddle).

I want to add a second horizontal above the image, and I’m following this earlier answer horizontal scrollbar on top and bottom of table and their jsfiddle https://jsfiddle.net/TBnqw/1/

But I can’t figure out which div or container to target in Lightbox with either the jQuery function that “echoes” the scrollbar to the top (in the accepted answer to the question above), or a pure CSS solution. Can I use jQuery append or prepend to add the div .wrapper1 to the markup output of Lightbox?

I’m loading the Lightbox script locally in the fiddle, in case it needs to be modified. I know that’s not a good idea, but worst case, we can.

HTML:

<a href="https://fastly.picsum.photos/id/11/2500/1667.jpg?hmac=xxjFJtAPgshYkysU_aqx2sZir-kIOjNR9vx0te7GycQ" data-lightbox="1">
<img src="https://fastly.picsum.photos/id/11/2500/1667.jpg?hmac=xxjFJtAPgshYkysU_aqx2sZir-kIOjNR9vx0te7GycQ" width="300">
</a>

CSS:

body.lb-disable-scrolling {
  overflow: hidden;
}

.center {
  text-align: center;
}

.new-div {
  overflow-x: scroll;
  overflow-y: hidden;
  height: 20px;
  background-color: red;
}

.lightboxOverlay {
  position: absolute;
  top: 0;
  left: 0;
  z-index: 9999;
  background-color: black;
  filter: progid:DXImageTransform.Microsoft.Alpha(Opacity=80);
  opacity: 0.8;
  display: none;
}

.lightbox {
  position: absolute;
  left: 0;
  width: 100%;
  z-index: 10000;
  text-align: center;
  line-height: 0;
  font-weight: normal;
  outline: none;
}

.lightbox .lb-image {
  display: block;
  width: 100% !important;
  height: auto !important;
  border-radius: 3px;
  border: 4px solid white;
}

.lightbox a img {
  border: none;
}

.lb-outerContainer {
  position: relative;
  *zoom: 1;
  margin: 0 auto;
  border-radius: 4px;
  background-color: white;
  margin-top: 30px;
}

.lb-outerContainer:after {
  content: "";
  display: table;
  clear: both;
}

.lb-loader {
  position: absolute;
  top: 43%;
  left: 0;
  height: 25%;
  width: 100%;
  text-align: center;
  line-height: 0;
}

.lb-cancel {
  display: block;
  width: 32px;
  height: 32px;
  margin: 0 auto;
  background: url(../images/loading.gif) no-repeat;
}

.lb-nav {
  position: absolute;
  top: 0;
  left: 0;
  height: 100%;
  width: 100%;
  z-index: 10;
}

.lb-container > .nav {
  left: 0;
}

.lb-nav a {
  outline: none;
  background-image: url("data:image/gif;base64,R0lGODlhAQABAPAAAP///wAAACH5BAEAAAAALAAAAAABAAEAAAICRAEAOw==");
}

.lb-prev,
.lb-next {
  height: 100%;
  cursor: pointer;
  display: block;
}

.lb-nav a.lb-prev {
  width: 20%;
  left: 0;
  float: left;
  background: url(../images/prev.png) left 48% no-repeat;
  filter: progid:DXImageTransform.Microsoft.Alpha(Opacity=0);
  opacity: 0;
  -webkit-transition: opacity 0.6s;
  -moz-transition: opacity 0.6s;
  -o-transition: opacity 0.6s;
  transition: opacity 0.6s;
}

.lb-nav a.lb-prev:hover {
  filter: progid:DXImageTransform.Microsoft.Alpha(Opacity=100);
  opacity: 1;
}

.lb-nav a.lb-next {
  width: 20%;
  right: 0;
  float: right;
  background: url(../images/next.png) right 48% no-repeat;
  filter: progid:DXImageTransform.Microsoft.Alpha(Opacity=0);
  opacity: 0;
  -webkit-transition: opacity 0.6s;
  -moz-transition: opacity 0.6s;
  -o-transition: opacity 0.6s;
  transition: opacity 0.6s;
}

.lb-nav a.lb-next:hover {
  filter: progid:DXImageTransform.Microsoft.Alpha(Opacity=100);
  opacity: 1;
}

.lb-dataContainer {
  margin: 0 auto;
  padding-top: 5px;
  *zoom: 1;
  width: 100%;
  border-bottom-left-radius: 4px;
  border-bottom-right-radius: 4px;
}

.lb-dataContainer:after {
  content: "";
  display: table;
  clear: both;
}

.lb-data {
  padding: 0 4px;
  color: #ccc;
}

.lb-data .lb-details {
  width: 85%;
  float: left;
  text-align: left;
  line-height: 1.1em;
}

.lb-data .lb-caption {
  font-size: 13px;
  font-weight: bold;
  line-height: 1em;
}

.lb-data .lb-caption a {
  color: #4ae;
}

.lb-data .lb-number {
  display: block;
  clear: left;
  padding-bottom: 1em;
  font-size: 12px;
  color: #999999;
}

.lb-data .lb-close {
  display: block;
  float: right;
  width: 30px;
  height: 30px;
  background: url(../images/close.png) top right no-repeat;
  text-align: right;
  outline: none;
  filter: progid:DXImageTransform.Microsoft.Alpha(Opacity=70);
  opacity: 0.7;
  -webkit-transition: opacity 0.2s;
  -moz-transition: opacity 0.2s;
  -o-transition: opacity 0.2s;
  transition: opacity 0.2s;
}

.lb-data .lb-close:hover {
  cursor: pointer;
  filter: progid:DXImageTransform.Microsoft.Alpha(Opacity=100);
  opacity: 1;
}
.lb-linkContainer {
  position: relative;
}

#lightbox {
  overflow-x: auto;
  cursor: pointer;
}

#lightbox.active {
  cursor: grabbing;
}
#lightbox::-webkit-scrollbar {
  display: none;
}
.lb-data .lb-close {
  display: block;
  float: right;
  width: 30px;
  height: 30px;
  background: url(../images/close.png) top right no-repeat;
  text-align: right;
  outline: none;
  filter: progid:DXImageTransform.Microsoft.Alpha(Opacity=70);
  opacity: 0.7;
  -webkit-transition: opacity 0.2s;
  -moz-transition: opacity 0.2s;
  -o-transition: opacity 0.2s;
  transition: opacity 0.2s;
  position: absolute;
  top: 10px;
  right: 20px;
}
.lb-closeContainer {
  background: rgba(0, 0, 0, 0.5);
  left: 0;
  width: 100%;
  height: 50px;
  position: fixed;
  top: 0;
  z-index: 99;
}
.admin-bar .lb-closeContainer {
  top: 32px;
}
.lb-closeContainer:before {
  content: "<-- Esc to close image. Use scroll bar to move left and right on wide images -->";
  color: white;
  font-size: 18px;
  position: relative;
  top: 25px;
}