[css] Position a div container on the right side

Just wanna update this for beginners now you should definitly use flexbox to do that, it's more appropriate and work for responsive try this : http://jsfiddle.net/x5vyC/3957/

#wrapper{
  display:flex;
  justify-content:space-between;
  background:red;
}


#c1{
   background:blue;
}


#c2{
    background:green;
}

<div id="wrapper">
    <div id="c1">con1</div>
    <div id="c2">con2</div>
</div>?