1 背景色渐变 background:#fb0000; background: -webkit-gradient(linear, left top, left bottom, color-stop(0%,#fb0000), color-stop(15%,#d50000), color-stop(75%,#c70000), color-stop(100%,#b20000)); background: -webkit-linear-gradient(top, #fb0000 0%,#d50000 1