커뮤니티 메뉴 아래에 삼각형을 공지사항 위 흰색 라인에 맞추려고 합니다

       그런데 도저히 안되네요

       고수님들 부탁 드립니다

      아래 어디를 어떻게 수정하면 될까요

    /* 상단메뉴 적용 */
.nav_2da:focus, .nav_2da:hover {text-decoration:none; background:#F00 !important; }
.nBox { position:relative; z-index:999999; }
.nBox_over { position:fixed; z-index:15; top:0px; width:100%; margin:-1px 0 0; }
.navi { position:relative; z-index:15; margin:-1px 0 0;height:4em; border-top:1px dotted #dde4e9;border-bottom:1px solid #dde4e9;background:#DB00B9; }
.navBox { position:relative; z-index:15; width:100%;}
.navBox:after {display:block;visibility:hidden;clear:both;content:""}
.nav { position:absolute; z-index:15; top:0px; left:50%; margin-left:-485px; }
.nav ul.depth1 {z-index:10; clear:both; zoom:1; }
.nav ul.depth1:after {display:block; visibility:hidden; clear:both; content:""; }
.nav ul.depth1 li.gnb1 { position:relative; float:left; text-align:center; display:inline; width:120px; }
.nav_1da {display:block; float:left; font-weight:bold; height:38px; padding:0 10px; line-height:4em; text-decoration:none; }
.nav_1da:focus, .nav_1da:hover {text-decoration:none; color:#ffffff; background:url(img/icon_top_arrow_black.png) no-repeat center 30px; }
.subBox { position:absolute; z-index:15; top:37px; width:100%; min-height:10px; background-color:#000; border-bottom:1px solid #F00; display:none; }
.subBox:after {display:block;visibility:hidden;clear:both;content:""}
.nav ul.depth1 ul.depth2 {position:absolute; width:120px; min-height:0px; top:55px; display:none;  }
.nav ul.depth1 ul.depth2 li {display:block !important; height:18px; margin-bottom:7px; }
.nav_2da {display:block; float:left; width:100px; height:30px; text-align:left; padding:0 10px; line-height:30px; text-decoration:none; color:#FFF !important; font-weight:bold;  }
.nav_2da:focus, .nav_2da:hover {text-decoration:none; background:#F00 !important; } ​