title: Website won't scroll down on certain browsers
body: <p>For some reason a website we've just put live won't scroll in certain browsers. It's hard to replicate but I've seen someone on a Mac using Chrome being unable to scroll down the page.</p>
  
  <p>Can anyone help? I'm thinking it might be a z-indexing issue but can't pin it down. I have noticed that the menu bar sometimes goes over the top of the scroll bar.</p>