#sf-menu<?php echo $bID?> .sf-menu li{background:none} <?php if(strlen($controller->menuColor)){ ?> #sf-menu<?php echo $bID?> .sf-menu li li{background-color:<?php echo $controller->menuColor ?> !important} <?php } ?> <?php if(strlen($controller->menuColor)){ ?> #sf-menu<?php echo $bID?> .sf-menu li li li{background-color:<?php echo $controller->menuColor ?> !important} <?php } ?>
Create a directory named autonav in your local blocks/ directory, and copy packages/superfish/blocks/autonav/view.php to this directory, and open it and make changes to the code itself.
Then, open view.php and look for lines referencing <?php echo $controller->menuColor ?>. Change those CSS lines to use transparent instead of the color.