scrolling menu in harlowe

Is there a way to make a div id scroll? I'm using one i call "menu" on the side with important links but there are too many to fit on a single page. I need a way for the reader to scroll along, especially if they're viewing the story in a mobile format.

I prefer the "fixed" look of the menu as it stays away from my content on the center of the page. If there's a more efficient or effective way to handle my menu experience, I'd appreciate suggestions.

#menu {
width: 13%;
position: fixed;
top: 0;
left: 0;
}