Flowfit

I think I've resolved this issue, in case anyone else comes across this and is wondering ...
I inserted more CSS to target a new image when viewing on mobile only using the following code.
/* CSS FOR MOBILE */
@mobile: ~"only screen and (max-width: 640px)";
/* CSS FOR MOBILE */
@media @mobile {
/* Insert Code for Mobile Below This Line*/
 li:nth-child(3) .accordion-item__description:after {
   width: 100%;
  margin: 0 auto;
    background-image: url(https://images.squarespace-cdn.com/content/v1/5f32fd0a60773f56ba2eb568/692c7b5a-d48a-4818-b057-4a10f5825741/parkingmap-mobile.png?format=300w);
  }
/* Insert Code for Mobile Above This Line */
}