css gradient

background-color: #000;
filter: progid:DXImageTransform.Microsoft.gradient(startColorstr='#bbb', endColorstr='#000');
background-image: -webkit-gradient(linear, left top, left bottom, from(#bbb), to(#000));
/* 
Google Chrome 4.0～9.0
Safari 4.0～5.0
iOS Safari 4.0.4～5.0 (iOS 3.2～4.2.1)
Android 2.1～3.0 */
background-image: -webkit-linear-gradient(top, #bbb, #000);
/*
Google Chrome 10.0～
Safari 5.1～
iOS Safari 5.1～ (iOS 5.0～)
Android 4.0～ */
background-image: -moz-linear-gradient(top, #bbb, #000);
background-image: -ms-linear-gradient(top, #bbb, #000);
background-image: -o-linear-gradient(top, #bbb, #000);
background-image: linear-gradient(top, #bbb, #000);