Create a CSS background gradient.
Use: http://www.colorzilla.com/gradient-editor/
background: #00b7ea; /* Old browsers */
background: -moz-linear-gradient(top, #00b7ea 0%, #009ec3 100%); /* FF3.6+ */
background: -webkit-gradient(linear, left top, left bottom, color-stop(0%,#00b7ea), color-stop(100%,#009ec3)); /* Chrome,Safari4+ */
background: -webkit-linear-gradient(top, #00b7ea 0%,#009ec3 100%); /* Chrome10+,Safari5.1+ */
background: -o-linear-gradient(top, #00b7ea 0%,#009ec3 100%); /* Opera 11.10+ */
background: -ms-linear-gradient(top, #00b7ea 0%,#009ec3 100%); /* IE10+ */
background: linear-gradient(to bottom, #00b7ea 0%,#009ec3 100%); /* W3C */
filter: progid:DXImageTransform.Microsoft.gradient( startColorstr='#00b7ea', endColorstr='#009ec3',GradientType=0 ); /* IE6-9 */