@mixin linear-gradient ($from, $to) {
  background: $from;
  background: -moz-linear-gradient(top, $from, $to);
  background: -webkit-gradient(linear, left top, left bottom, color-stop(0, $from), color-stop(1, $to));
}

@mixin linear-gradient ($from, $to) {
  background: $from;
  background: -moz-linear-gradient(top, $from, $to);    // FF3.6
  background: -ms-linear-gradient(top, $from, $to);     // IE10
  background: -o-linear-gradient(top, $from, $to);      // Opera 11.10+
  background: -webkit-gradient(linear, left top, left bottom, color-stop(0, $from), color-stop(1, $to)); // Saf4+, Chrome
  background: -webkit-linear-gradient(top, $from, $to); // Chrome 10+, Saf5.1+
  background: linear-gradient(top, $from, $to);
}
Support more vendor specific linear-gradients
Support more vendor specific linear-gradients
