The Webflow mobile navigation does not allow overflow scroll out of the box and so you may find that if the content is cut off vertically at the base. To fix this issue we need to add a few simple modifications to the main Webflow 'Nav Menu' (typically .nav-menu) class on the mobile menu breakpoint:-

  1. Set a vertical height of 100vh
  2. Set the Overflow to 'Auto'
Webflow Nav Menu Mobile Overflow settings

The CSS is as follows:-

A simple fix with minimal code.