Is it possible to add a floating banner on a cart page?

So I've created a floating banner that directs to WhatsApp with the Add block > Code widget. 

However, since the add block feature is not working on the cart page, I'd like to know if there are any ways to add this floating banner (like using JS?) throughout the website, not only on specific pages. 

Here's my code for the floating banner

<style>
/* floating banner  */
.fltBanner2 {
	position: fixed;
	right: 30px; /* distance from left(px) */
	top: 630px; /* distance from the top(px) */
	display: inline;
	z-index: 999;
}
</style>


<!-- 전화연락 -->
<a href="https://api.whatsapp.com/message/TJOJYPO7OSXAM1?autoload=1&app_absent=0" class="fltBanner2" target="_blank">
	<img src="https://cdn.imweb.me/upload/S2023092066b5f5a2d5be5/9c424c8d7901e.png" width="70px" height="70px">
</a>

where did you insert your code?

2 hours ago, david7u7 said:

where did you insert your code?

@david7u7 I used a code block and inserted the code in the regular pages except the cart and log in where I have a problem adding a code. 

Use this code to Website > Website Tools > Code Injection > Footer

<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.7.0/jquery.min.js"></script>
<script>
$(document).ready(function(){
	$('<a href="https://api.whatsapp.com/message/TJOJYPO7OSXAM1?autoload=1&app_absent=0" class="fltBanner2" target="_blank"><img src="https://cdn.imweb.me/upload/S2023092066b5f5a2d5be5/9c424c8d7901e.png" width="70px" height="70px"></a>').appendTo('body#cart');
});
</script>
<style>
/* floating banner  */
.fltBanner2 {
	position: fixed;
	right: 30px; /* distance from left(px) */
	bottom: 10px; /* distance from the top(px) */
	display: inline;
	z-index: 999;
}
</style>