kind-fill($this)
  position: utilus_retrieve($this.params, fixed static sticky, absolute)

  $sides = utilus_get_sides($this.arguments)
  top: $sides[0]
  right: $sides[1]
  bottom: $sides[2]
  left: $sides[3]

  $bg = $this.strings[0]
  $bg_color = $this.colors[0]
  if $bg
    $bg_color = unquote('') unless $bg_color
    background: $bg_color url($bg) utilus_retrieve($this.params, repeat repeat-x repeat-y , no-repeat) 50%
    // How to add bgposition here?
  else if $bg_color
    background: $bg_color