당신은 다음과 같이 그라데이션을 사용할 수 http://jsfiddle.net/F3M5e/
관련 코드 :
background: #1e5799; /* Old browsers */
background: -moz-linear-gradient(top, #1e5799 0%, #1e5799 50%, #000000 50%, #000000 100%); /* FF3.6+ */
background: -webkit-gradient(linear, left top, left bottom, color-stop(0%,#1e5799), color-stop(50%,#1e5799), color-stop(50%,#000000), color-stop(100%,#000000)); /* Chrome,Safari4+ */
background: -webkit-linear-gradient(top, #1e5799 0%,#1e5799 50%,#000000 50%,#000000 100%); /* Chrome10+,Safari5.1+ */
background: -o-linear-gradient(top, #1e5799 0%,#1e5799 50%,#000000 50%,#000000 100%); /* Opera 11.10+ */
background: -ms-linear-gradient(top, #1e5799 0%,#1e5799 50%,#000000 50%,#000000 100%); /* IE10+ */
background: linear-gradient(to bottom, #1e5799 0%,#1e5799 50%,#000000 50%,#000000 100%); /* W3C */
filter: progid:DXImageTransform.Microsoft.gradient(startColorstr='#1e5799', endColorstr='#000000',GradientType=0); /* IE6-9 */
편집 : 가로 방향 기울기 http://jsfiddle.net/F3M5e/1/