
linear_gradient(origin, colors...)
    
  fallback = colors[1][0]

  colors = join(', ', colors)
  colors = unquote(colors)

  background-color: fallback
  background-image: -webkit-linear-gradient(origin, colors) // Chrome, Safari
  background-image:    -moz-linear-gradient(origin, colors) // Firefox (3.6 - 15)
  background-image:     -ms-linear-gradient(origin, colors) // IE 10
  background-image:      -o-linear-gradient(origin, colors) // Opera (11.1 - 12.0) 
  background-image:         linear-gradient(origin, colors) // W3C
