Navigation rail

<NavigationRail>
    <NavigationRailItem
        active
        href="#"
        icon="inbox"
    >
        Inbox
    </NavigationRailItem>
    <NavigationRailHeader>
        Folders
    </NavigationRailHeader>
    <NavigationRailItem
        href="#"
        icon="send"
    >
        Outbox
    </NavigationRailItem>
    <NavigationRailItem
        href="#"
        icon="favorite"
    >
        Favorites
    </NavigationRailItem>
    <NavigationRailItem
        href="#"
        icon="report"
    >
        Spam
    </NavigationRailItem>
</NavigationRail>