使用できます
Colorzilla グラデーション ジェネレーター: http://colorzilla.com/gradient-editor/
および CSS3Pie: http://css3pie.com
これを試して:
background: #8c9cbf; /* Old browsers */
/* IE9 SVG, needs conditional override of 'filter' to 'none' */
background: url(data:image/svg+xml;base64,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);
background: -moz-linear-gradient(top, #8c9cbf 0%, #546a9e 50%, #36518f 51%, #3d5691 100%); /* FF3.6+ */
background: -webkit-gradient(linear, left top, left bottom, color-stop(0%,#8c9cbf), color-stop(50%,#546a9e), color-stop(51%,#36518f), color-stop(100%,#3d5691)); /* Chrome,Safari4+ */
background: -webkit-linear-gradient(top, #8c9cbf 0%,#546a9e 50%,#36518f 51%,#3d5691 100%); /* Chrome10+,Safari5.1+ */
background: -o-linear-gradient(top, #8c9cbf 0%,#546a9e 50%,#36518f 51%,#3d5691 100%); /* Opera 11.10+ */
background: -ms-linear-gradient(top, #8c9cbf 0%,#546a9e 50%,#36518f 51%,#3d5691 100%); /* IE10+ */
background: linear-gradient(to bottom, #8c9cbf 0%,#546a9e 50%,#36518f 51%,#3d5691 100%); /* W3C */
filter: progid:DXImageTransform.Microsoft.gradient( startColorstr='#8c9cbf', endColorstr='#3d5691',GradientType=0 ); /* IE6-8 */
および IE9 でのサポート:
<!--[if gte IE 9]>
<style type="text/css">
.gradient {
filter: none;
}
</style>
<![endif]-->