Here are my links to see the corresponding issues. Ditto to @tfos74. And I don’t know any css, so if you have some fixes for the css causing problems, that would be great! But, if it looks like more than a simple fix, let me know if I need to send you an E-mail with these issues for a quote.
http://jntvisuals.com/galleries/fine-art-store/
http://jntvisuals.com/galleries/fine-art-store/shopping-cart/
Much appreciated!