Change Overlay factor

I am not completely inexperienced, but I cant figure out how to change the overlay factor in the Firm theme for the zoom box.
I found the code to be originated in the theme-shortcodes.php file: 
$output .= '<div class="desc" style="background-color:'. hex2rgba( $bg_color, 0.8 ) .';">';

I want to change the overlay factor to 0.95

I dont want to edit the php file. Can I use the Custom | Classes in column to accomplish this? How?

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