I have an issue where my drop shadow shows in Firefox and Chrome, but not in MS Edge for some reason. I have cleared my cache and it just reproduces the same result and doesn't show in Microsoft Edge.
box-shaddow: 0px 4px 15px -2px rgba(0,0,0,0.54)
-moz-box-shadow: 0px 4px 15px -2px rgba(0,0,0,0.54)
-webkit-box-shadow: 0px 4px 15px -2px rgba(0,0,0,0.54)
border-collapse: separate
This works (you might have to play with the shadow to suit your preference):