CSS3: Background gradient
selector {
background: #e0e0e0; /* Old browsers */
background: -moz-linear-gradient(top, #ffffff 1%, #e0e0e0 100%); /* FF3.6+ */
background: -webkit-gradient(linear, left top, left bottom, color-stop(1%,#ffffff), color-stop(100%,#e0e0e0)); /* Chrome,Safari4+ */
background: -webkit-linear-gradient(top, #ffffff 1%,#e0e0e0 100%); /* Chrome10+,Safari5.1+ */
background: -o-linear-gradient(top, #ffffff 1%,#e0e0e0 100%); /* Opera 11.10+ */
background: -ms-linear-gradient(top, #ffffff 1%,#e0e0e0 100%); /* IE10+ */
background: linear-gradient(to bottom, #ffffff 1%,#e0e0e0 100%); /* W3C */
}