Flipping gray levels on mouse over #4
Description
It would be nicer to have a flipping of light gray and darker gray on the list of talks as we mouse over the large list. We did have that working before the introduction of the accordion for the abstracts. Some of this function seems to be present in the CSS file. It would be nicer to locate the problem and make it work.
Please test at a minimum on Chrome, Firefox, Edge, Safari, Android and iOS.