Flexbox reorder

HTML

<div id="container">
    <div id="div1">1</div>  
    <div id="div2">2</div>  
    <div id="div3">3</div>
</div>

CSS

#container{
  display: flex;
  flex-direction: column;
}

#div2{
  order:2
}

#div3{
  order:1
}