css3.sass

=expand
  overflow: hidden
  zoom: 1

=border-radius($tl, $tr, $br, $bl)
  -o-border-top-left-radius: $tl
  -o-border-top-right-radius: $tr
  -o-border-bottom-right-radius: $br
  -o-border-bottom-left-radius: $bl
  
  -moz-border-radius-topleft: $tl
  -moz-border-radius-topright: $tr
  -moz-border-radius-bottomright: $br
  -moz-border-radius-bottomleft: $bl
  
  -webkit-border-top-left-radius: $tl
  -webkit-border-top-right-radius: $tr
  -webkit-border-bottom-right-radius: $br
  -webkit-border-bottom-left-radius: $bl

  border-top-left-radius: $tl
  border-top-right-radius: $tr
  border-bottom-right-radius: $br
  border-bottom-left-radius: $bl
  
=box-shadow($c, $x, $y, $d)
  -o-box-shadow: $c $x $y $d
  -moz-box-shadow: $c $x $y $d
  -webkit-box-shadow: $c $x $y $d
  box-shadow: $c $x $y $d

=gradient($top, $bottom)
  background: $bottom
  background-image: -webkit-gradient(linear, left top, left bottom, from($top), to($bottom))

=box-sizing($mode)
  -o-box-sizing: $mode
  -moz-box-sizing: $mode
  -webkit-box-sizing: $mode
  box-sizing: $mode
  
=background-size($mode)
  -o-background-size: $mode
  -moz-background-size: $mode
  -webkit-background-size: $mode
  background-size: $mode
  
=column-width($n)
  -o-column-width: $n
  -moz-column-width: $n
  -webkit-column-width: $n
  column-width: $n

=column-gap($n)
  -o-column-gap: $n
  -moz-column-gap: $n
  -webkit-column-gap: $n
  column-gap: $n
  
=column-count($n)
  -o-column-count: $n
  -moz-column-count: $n
  -webkit-column-count: $n
  column-count: $n
  
=column-rule($n, $s, $c)
  -o-column-rule: $n $s $c
  -moz-column-rule: $n $s $c
  -webkit-column-rule: $n $s $c
  column-rule: $n $s $c