Strange vertical line below colorway theme slider.

It’s part of the slider details, you can put in the slider info via theme option. In other words, configure the theme properly.

If you don’t want that part to appear at all, use this code in Custom CSS Plugin

.salesdetails { display: none; }

Another issue, if you don’t mind, is the postal address and tel number as header image. It’s bad UX especially in this case a site with target user group of old folks. Try viewing the site in mobile view, the text in image become unreadable. Postal address and phone number should be real text, copyable.