$fallback_hex_gradient_bg;
  background-image: linear-gradient(to right, $startColour, $endColour);
  background-image: -webkit-gradient(linear, 0 0, 100% 0, from($startColour), to($endColour));
  background-image: -webkit-linear-gradient(left, $startColour, $endColour);
  background-image: -moz-linear-gradient(left, $startColour, $endColour);
  background-image: -o-linear-gradient(left, $startColour, $endColour);
  background-repeat: repeat-x;
}

@mixin vertical-gradient($startColour, $endColour) {
  backg