Classes list

Every class Nav rail recognizes, straight from the @flickui/css source.

ClassPurpose
.nav-railBase class on the container — required, sets the fixed rail width
.nav-rail-itemEach destination link/button (aria-current="page" marks the active one)
.nav-rail-iconThe icon glyph, given a pill-shaped hover/active background
.nav-rail-labelThe short text label beneath the icon