背景颜色加上渐变

background: -moz-linear-gradient(top, #353c63 0%, #1b203c 100%);
background: -webkit-gradient(linear, left top, left bottom, color-stop(0%, #353c63), color-stop(100%, #1b203c));
background: -webkit-linear-gradient(top, #353c63 0%, #1b203c 100%);
background: -o-linear-gradient(top, #353c63 0%, #1b203c 100%);
background: -ms-linear-gradient(top, #353c63 0%, #1b203c 100%);
background: linear-gradient(to bottom, #353c63 0%, #1b203c 100%);