For a start test responsiveness of content and embedded elements. Then secondly don’t have a live chat window take over the viewport and obscure content.
Viewing on mobile and it was a horrific experience and the irony of this is definitely not lost on me.
Everyone can easily make website accessible by following small steps" content is king, use proper content management system, make it accessible for your users, give proper content structure. use alt text for images, give a unique name to URL. select user-friendly design and theme just like (www.reecoupons.com) might help you.