[MarkFL]

Create plugin hooked at "parse_templates" with the following code:

PHP Code:

if ((THIS_SCRIPT === 'arcade' OR strpos($_SERVER['REQUEST_URI'], 'arcade')) AND STYLEID == XX)
{
    $template_hook['headinclude_css'] .= '<style>.alt1 legend {color: $FFFFFF !important;}</style>';
} 


Change "XX" to the styleid of the dark style in which you are wanting to make the changes.