title: Links in a fixed element don't work when overflow hidden
body: <p>Here is my simplified problem :      <a href="https://jsfiddle.net/44sjaq1q/2" rel="nofollow">https://jsfiddle.net/44sjaq1q/2</a>    </p>
  
  <p>I use a fixed bottom menu hidden with <code>z-index:-1</code> <code>position:fixed</code>, and revealed with the scroll. But, the links in the menu don't work.</p>
  
  <p>In my page, I use elements creating a x-scrolling, but i use a <code>overflow-x: hidden</code>, to unabled the horizontal movement.</p>
  
  <p>It seems the two rules can't work in the same time. </p>
  
  <p>Thanks for your help.</p>