adm/css/admin.css

gnb부분을 수정하셔야할 듯... 

default.css 파일에서



/* 메인메뉴 */

.gnb_1dli_over2 .gnb_2dul {display:block;right:0;background:#fff}
#gnb h2 {position:absolute;font-size:0;line-height:0;overflow:hidden
#gnb_1dul {margin:0 auto !important;padding:0;width:970px;zoom:1}
#gnb_1dul:after {display:block;visibility:hidden;clear:both;content:""}
.gnb_1dli {z-index:10;position:relative;float:left}
.gnb_1da {display:inline-block;padding:0 40px 0 10px;height:35px;background:url('../img/gnb_bg00.gif') center right no-repeat;font-weight:bold;line-height:2.95em;text-decoration:none}
.gnb_1da:focus, .gnb_1da:hover {background:url('../img/gnb_bg00.gif') #333 center right no-repeat;text-decoration:none}
.gnb_1dli_air .gnb_1da {background-color:#333;color:#fff}
.gnb_1dli_on .gnb_1da {background-color:#333;color:#fff}
.gnb_2dul {display:none;position:absolute;top:35px;width:180px}
.gnb_2da {display:block;padding:13px 10px;text-align:left;text-decoration:none}
.gnb_1dli_air .gnb_2da {background-color:#333;color:#fff}
.gnb_1dli_on .gnb_2da {background-color:#333;color:#fff}
.gnb_2da:focus, .gnb_2da:hover {background:#666;text-decoration:none}
.gnb_1dli_over .gnb_2dul {display:block;left:0;background:#fff}
.gnb_1dli_over2 .gnb_2dul {display:block;right:0;background:#fff}​



이 부분이 메뉴 관련 css입니다