border-radius()
  -webkit-border-radius arguments
  -moz-border-radius arguments
  border-radius arguments

a.button
  border-radius 5px

fonts = helvetica, arial, sans-serif

body {
  padding: 50px;
  font: 14px/1.4 fonts;
}

form
  input[type=text]
    padding: 5px
    border: 1px solid #eee
    color: #ddd

textarea
  @extends form input[type=text]
  padding: 10px

$foo
  color: #FFF

.bar
  background: #000
  @extends $foo