title: css overflow-x:auto to show only when width less than certain amount
body: <p>my <code>&lt;html style="overflow-x:hidden; overflow-y:hidden</code></p>
  
  <p>inside have a div with overflow-x:auto; overflow-y:scroll; min-width:960px;    but when my browser viewing mode is larger than 960px, it still showing the horizontal scroll bar. how to make the horizontal scoll bar only show if necessary when width less than 960?</p>