This is a class in jquery.mobile-1.0b1.min.css, here I used gradient colors on the Internet like # a2cbe7 and # 6aaedb. You can replace them with your color codes.
.ui-bar-b{border:1px solid #456f9a;background:#6aaedb;color:#fff;font-weight:bold;text-shadow:0 -1px 1px #254f7a;background: #6aaedb; background: -moz-linear-gradient(top, #6aaedb 0%, #a1cae6 100%); background: -webkit-gradient(linear, left top, left bottom, color-stop(0%,#6aaedb), color-stop(100%,#a1cae6)); background: -webkit-linear-gradient(top, #6aaedb 0%,#a1cae6 100%); background: -o-linear-gradient(top, #6aaedb 0%,#a1cae6 100%); background: -ms-linear-gradient(top, #6aaedb 0%,#a1cae6 100%); background: linear-gradient(to bottom, #6aaedb 0%,#a1cae6 100%); filter: progid:DXImageTransform.Microsoft.gradient( startColorstr='#6aaedb', endColorstr='#a1cae6',GradientType=0 );}
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