역시 해당 파일 찾아서 css도 수정도 해보고 했는데요.

 style="background:none;" 적용하면 투명해지는게 아닌지요.

배너 표시한 <div style="background:none;"

<div class="gpe_pm_topban">
    <div class="loading_tb">
        <?php
            if(file_exists(G5_THEME_PATH."/img/img_file/set_topban1_img" ) or file_exists(G5_THEME_PATH."/img/img_file/set_topban2_img") or file_exists(G5_THEME_PATH."/img/img_file/set_topban3_img") or file_exists(G5_THEME_PATH."/img/img_file/set_topban4_img") or file_exists(G5_THEME_PATH."/img/img_file/set_topban5_img")) {
                if(file_exists(G5_THEME_PATH."/img/img_file/set_topban1_img")) $var_mb = '/img_file/set_topban1_img?ver=';
                elseif(file_exists(G5_THEME_PATH."/img/img_file/set_topban2_img")) $var_mb = '/img_file/set_topban2_img?ver=';
                elseif(file_exists(G5_THEME_PATH."/img/img_file/set_topban3_img")) $var_mb = '/img_file/set_topban3_img?ver=';
                elseif(file_exists(G5_THEME_PATH."/img/img_file/set_topban4_img")) $var_mb = '/img_file/set_topban4_img?ver=';
                elseif(file_exists(G5_THEME_PATH."/img/img_file/set_topban5_img")) $var_mb = '/img_file/set_topban5_img?ver=';
        ?>

5개 배너이미지를 업로드시 롤링되도록 되어있습니다.

어디를 수정해야 배너 배경이 투명해지는지요.

참고 사이트 https://totalmilitary.net/