Swap div position with media query

Question

When browser width becomes under 600px, I'd like such a position change, thanks to a media query :

It seems that this would need to swap div position. Is this possible with CSS?

* { padding: 0; margin: 0; }
#a { float: left; background-color: red; width: 150px; }
#b { background-color: blue; }
#c { float: right; width: 40%; background-color: yellow; }
@media (max-width: 600px) { 
        /* ... */
}

<div>
   <div id="a">a</div>
   <div id="c">c</div>
   <div id="b">b</div>
</div>

Answer 1

You only need to reset the float or width properties.

Do mind the BFC block formating context when you deal with floating and non floatting elements.

http://www.sitepoint.com/understanding-block-formatting-contexts-in-css/

* {
  padding: 0;
  margin: 0;
}
#a {
  float: left;
  background-color: red;
  width: 150px;
}
#b {
  background-color: blue;
}
#c {
  float: right;
  width: 40%;
  background-color: yellow;
}
@media (max-width: 600px) {
  #c {    
    width: 100%;
  }
}

<div>
  <div id="a">a float</div>
  <div id="c">c float or not</div>
  <div id="b">b</div>
</div>