这是我的代码:

background: #e8e3e3; /* Old browsers */
  background: -moz-linear-gradient(top,  rgba(232, 227, 227, 0.95) 0%, rgba(246, 242, 242, 0.95) 100%); /* FF3.6+ */
  background: -webkit-gradient(linear, left top, left bottom, color-stop(0%,rgba(232, 227, 227, 0.95)), color-stop(100%,rgba(246, 242, 242, 0.95))); /* Chrome,Safari4+ */
  background: -webkit-linear-gradient(top,  rgba(232, 227, 227, 0.95) 0%,rgba(246, 242, 242, 0.95) 100%); /* Chrome10+,Safari5.1+ */
  background: -o-linear-gradient(top,  rgba(232, 227, 227, 0.95) 0%,rgba(246, 242, 242, 0.95) 100%); /* Opera 11.10+ */
  background: -ms-linear-gradient(top,  rgba(232, 227, 227, 0.95) 0%,rgba(246, 242, 242, 0.95) 100%); /* IE10+ */
  background: linear-gradient(to bottom,  rgba(232, 227, 227, 0.95) 0%,rgba(246, 242, 242, 0.95) 100%); /* W3C */
  filter: progid:DXImageTransform.Microsoft.gradient( startColorstr='rgba(232, 227, 227, 0.95)', endColorstr='rgba(246, 242, 242, 0.95)',GradientType=0 ); /* IE6-9 */

所有现代浏览器(从Chrome 26、Opera 12.1、IE 10和Firefox 16开始)都支持新语法:http://caniuse.com/#feat=css-gradients

background: linear-gradient(to bottom, rgba(0, 0, 0, 1), rgba(0, 0, 0, 0));

这将呈现一个渐变，从顶部的纯黑色开始，到底部的全透明。

MDN上的文档。

这是我的代码:

background: #e8e3e3; /* Old browsers */
  background: -moz-linear-gradient(top,  rgba(232, 227, 227, 0.95) 0%, rgba(246, 242, 242, 0.95) 100%); /* FF3.6+ */
  background: -webkit-gradient(linear, left top, left bottom, color-stop(0%,rgba(232, 227, 227, 0.95)), color-stop(100%,rgba(246, 242, 242, 0.95))); /* Chrome,Safari4+ */
  background: -webkit-linear-gradient(top,  rgba(232, 227, 227, 0.95) 0%,rgba(246, 242, 242, 0.95) 100%); /* Chrome10+,Safari5.1+ */
  background: -o-linear-gradient(top,  rgba(232, 227, 227, 0.95) 0%,rgba(246, 242, 242, 0.95) 100%); /* Opera 11.10+ */
  background: -ms-linear-gradient(top,  rgba(232, 227, 227, 0.95) 0%,rgba(246, 242, 242, 0.95) 100%); /* IE10+ */
  background: linear-gradient(to bottom,  rgba(232, 227, 227, 0.95) 0%,rgba(246, 242, 242, 0.95) 100%); /* W3C */
  filter: progid:DXImageTransform.Microsoft.gradient( startColorstr='rgba(232, 227, 227, 0.95)', endColorstr='rgba(246, 242, 242, 0.95)',GradientType=0 ); /* IE6-9 */

我刚刚看到了一个最近的例子。为了简化和使用最新的例子，给css一个选择器类'grad'，(我已经包括了向后兼容性)

.grad {
    background-color: #F07575; /* fallback color if gradients are not supported */
    background-image: -webkit-linear-gradient(top left, red, rgba(255,0,0,0));/* For Chrome 25 and Safari 6, iOS 6.1, Android 4.3 */
    background-image: -moz-linear-gradient(top left, red, rgba(255,0,0,0));/* For Firefox (3.6 to 15) */
    background-image: -o-linear-gradient(top left, red, rgba(255,0,0,0));/* For old Opera (11.1 to 12.0) */
    background-image: linear-gradient(to bottom right, red, rgba(255,0,0,0)); /* Standard syntax; must be last */
}

从 https://developer.mozilla.org/en-US/docs/Web/CSS/linear-gradient

这是一些非常酷的东西!我需要几乎相同的，但水平梯度从白色到透明。它工作得很好!这是我的代码:

.gradient{
        /* webkit example */
        background-image: -webkit-gradient(
          linear, right top, left top, from(rgba(255, 255, 255, 1.0)),
          to(rgba(255, 255, 255, 0))
        );

        /* mozilla example - FF3.6+ */
        background-image: -moz-linear-gradient(
          right center,
          rgba(255, 255, 255, 1.0) 20%, rgba(255, 255, 255, 0) 95%
        );

        /* IE 5.5 - 7 */
        filter: progid:DXImageTransform.Microsoft.gradient(
          gradientType=1, startColor=0, endColorStr=#FFFFFF
        );

        /* IE8 uses -ms-filter for whatever reason... */
        -ms-filter: progid:DXImageTransform.Microsoft.gradient(
          gradientType=1, startColor=0, endColoStr=#FFFFFF
        );
    }

下面是我用来为相同的颜色生成从完全不透明(上)到透明度20%(下)的垂直梯度的一个:

background: linear-gradient(to bottom, rgba(0, 64, 122, 1) 0%,rgba(0, 64, 122, 0.8) 100%); /* W3C, IE10+, FF16+, Chrome26+, Opera12+, Safari7+ */
background: -o-linear-gradient(top, rgba(0, 64, 122, 1) 0%, rgba(0, 64, 122, 0.8) 100%); /* Opera 11.10+ */
background: -moz-linear-gradient(top, rgba(0, 64, 122, 1) 0%, rgba(0, 64, 122, 0.8) 100%); /* FF3.6-15 */
background: -webkit-linear-gradient(top, rgba(0, 64, 122, 1) 0%,rgba(0, 64, 122, 0.8) 100%); /* Chrome10-25,Safari5.1-6 */
background: -ms-linear-gradient(top, rgba(0, 64, 122, 1) 0%,rgba(0, 64, 122, 0.8) 100%); /* IE10+ */
-ms-filter: progid:DXImageTransform.Microsoft.gradient( startColorstr='#00407a', endColorstr='#cc00407a',GradientType=0 ); /* IE8 */
filter: progid:DXImageTransform.Microsoft.gradient( startColorstr='#00407a', endColorstr='#cc00407a',GradientType=0 ); /* IE 5.5 - 9 */