_gradient.sass

=v-gradient(!top_color, !bottom_color, !midpoint_color = false, !midpoint = false)
  @if !midpoint_color == false
    !midpoint_color = !top_color / 2 + !bottom_color / 2
  @if !midpoint == false
    !midpoint = 50%
  background: -webkit-gradient(linear, center top, center bottom, from(#{!top_color}), color-stop(#{!midpoint}, #{!midpoint_color}), to(#{!bottom_color}))
  background: -moz-linear-gradient(top, #{!top_color}, #{!midpoint_color} #{!midpoint}, #{!bottom_color})