style: 다크모드 고려 컨테이너내 배경색 고정 삭제

ui/styles.css

@@ -53,7 +53,7 @@ html {
        font-size: 16px !important;
        padding: 12px 16px !important;
        border-radius: 8px !important;
-       border: 2px solid #e0e0e0 !important;
+       /* border: 2px solid #e0e0e0 !important; */
        transition: border-color 0.3s ease !important;
    
        /* 🔹 input 높이 고정 */
@@ -109,9 +109,9 @@ html {
    .leaderboard-group {
        margin: 18px 0 28px 0 !important;
        padding: 12px 14px !important;
-       border: 1px solid #eee;
+       /* border: 1px solid #eee; */
        border-radius: 12px;
-       background: #ffffff;
+       /* background: #ffffff; */
    }
    
    .leaderboard-table {