An example of CSS Flexible Box in early 2013

flexible-box.css

#foo {
  display: -webkit-box;
  display: -moz-box;
  display: -ms-box;
  display: -webkit-flex;
  display: box;
  display: flex;
  -webkit-box-orient: vertical;
  -moz-box-orient: vertical;
  -o-box-orient: vertical;
  -ms-box-orient: vertical;
  -webkit-flex-direction: column;
  flex-direction: column;
  -webkit-box-pack: center;
  -moz-box-pack: center;
  -o-box-pack: center;
  -ms-box-pack: center;
  -webkit-justify-content: center;
  justify-content: center;
  -webkit-box-align: center;
  -moz-box-align: center;
  -o-box-align: center;
  -ms-box-align: center;
  -webkit-align-items: center;
  align-items: center;
}