Linear Gradient

.lineargradient {
  background-color: #444444; /* Si el navegador no soporta gradientes */
  background-image: -webkit-gradient(linear, left top, left bottom, from(#444444), to(#999999)); /* Safari 4+, Chrome */
  background-image: -webkit-linear-gradient(top, #444444, #999999); /* Chrome 10+, Safari 5.1+, iOS 5+ */
  background-image:    -moz-linear-gradient(top, #444444, #999999); /* Firefox 3.6-15 */
  background-image:      -o-linear-gradient(top, #444444, #999999); /* Opera 11.10 - 12.00 */
  background-image:         linear-gradient(to bottom, #444444, #999999); /* Firefox 16+, IE10, Opera 12.50+ */
}