您不能在一行代码中使渐变与所有浏览器兼容..您必须为不同的浏览器添加更多兼容的行..试试这个..
background: rgb(105,108,113); /* Old browsers */
background: -moz-linear-gradient(left, rgba(105,108,113,1) 30%, rgba(205,207,209,1) 81%, rgba(205,207,209,1) 100%); /* FF3.6+ */
background: -webkit-gradient(linear, left top, right top, color-stop(30%,rgba(105,108,113,1)), color-stop(81%,rgba(205,207,209,1)), color-stop(100%,rgba(205,207,209,1))); /* Chrome,Safari4+ */
background: -webkit-linear-gradient(left, rgba(105,108,113,1) 30%,rgba(205,207,209,1) 81%,rgba(205,207,209,1) 100%); /* Chrome10+,Safari5.1+ */
background: -o-linear-gradient(left, rgba(105,108,113,1) 30%,rgba(205,207,209,1) 81%,rgba(205,207,209,1) 100%); /* Opera 11.10+ */
background: -ms-linear-gradient(left, rgba(105,108,113,1) 30%,rgba(205,207,209,1) 81%,rgba(205,207,209,1) 100%); /* IE10+ */
background: linear-gradient(to right, rgba(105,108,113,1) 30%,rgba(205,207,209,1) 81%,rgba(205,207,209,1) 100%); /* W3C */
filter: progid:DXImageTransform.Microsoft.gradient( startColorstr='#696c71', endColorstr='#cdcfd1',GradientType=1 ); /* IE6-9 */