90% and 85% work fine for me (15" and 27" screens) > We don't have to have boxes around the menu items it was just an example.
I've just commented those styles in Chrome dev tool, and I think the
menu looks cleaner without extra borders and shadows.
.menu {
/* border: 1px solid lightgray; */
/* box-shadow: 5px 5px 10px rgba(20, 20, 20, 0.3); */
Vladimir
