Nav menu buttons don't take up full block

I can click on parts of the navigation menu buttons without changing the page. If I click low or high on the button, or near a corner, it changes the style, but doesn't change the page.


Start by reproducing the navigation-menu behavior shown in the linked GIF and locating the menu's implementation in the JavaScript application. Trace the clickable area for each button and verify that clicking anywhere within the visible button block changes the page without changing its intended styling.

Written by the indexing model from the issue text.