渐变
#gradient {
background-image: -moz-linear-gradient( top, #81a8cb, #4477a1 ); /* Firefox 3.6 */
background-image: -webkit-gradient(linear , left bottom , left top , color-stop( 0, #4477a1 ) , color-stop( 1, #81a8cb )); /* Safari & Chrome */
filter: progid:DXImageTransform.Microsoft.gradient( GradientType= 0 , startColorstr = '#81a8cb', endColorstr = '#4477a1' ); /* IE6 & IE7 */
-ms-filter: "progid:DXImageTransform.Microsoft.gradient( GradientType = 0,startColorstr = '#81a8cb', endColorstr = '#4477a1' )"; /* IE8 */
}