このツールを使用して、Cssスタイルを生成します
http://www.colorzilla.com/gradient-editor/
クリックImport from css
background: rgb(85,170,238); /* 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, rgba(85,170,238,1) 0%, rgba(0,51,102,1) 100%); /* FF3.6+ */
background: -webkit-gradient(linear, left top, left bottom, color-stop(0%,rgba(85,170,238,1)), color-stop(100%,rgba(0,51,102,1))); /* Chrome,Safari4+ */
background: -webkit-linear-gradient(top, rgba(85,170,238,1) 0%,rgba(0,51,102,1) 100%); /* Chrome10+,Safari5.1+ */
background: -o-linear-gradient(top, rgba(85,170,238,1) 0%,rgba(0,51,102,1) 100%); /* Opera 11.10+ */
background: -ms-linear-gradient(top, rgba(85,170,238,1) 0%,rgba(0,51,102,1) 100%); /* IE10+ */
background: linear-gradient(to bottom, rgba(85,170,238,1) 0%,rgba(0,51,102,1) 100%); /* W3C */
filter: progid:DXImageTransform.Microsoft.gradient( startColorstr='#55aaee', endColorstr='#003366',GradientType=0 ); /* IE6-8 */