Linear-Gradient:

Extra notes:

Using Background instead of background-image lets you use extra settings like
'repeat fixed 0 0 transparent' which helps if your using a linear gradient background on a large section so it doesn't start repeating.

background:-moz-linear-gradient(center top , black, lightblue) repeat fixed 0 0 transparent;
background:-o-linear-gradient(center top , black, lightblue) repeat fixed 0 0 transparent;
background:-webkit-gradient(linear, left top, left bottom, from(black), to(lightblue)) repeat fixed 0 0 transparent;