CSS 渐变色如何写,以及兼容性写法
background: -webkit-linear-gradient(left, #0f0f0f, #0c0c0c, #272727);
/* Safari 5.1 - 6.0 */
background: -o-linear-gradient(left, #0f0f0f, #0c0c0c, #272727);
/* Opera 11.1 - 12.0 */
background: -moz-linear-gradient(left, #0f0f0f, #0c0c0c, #272727);
/* Firefox 3.6 - 15 */
background: linear-gradient(to right, #0f0f0f, #0c0c0c, #272727);
/* 标准的语法 */