I don’t know if you got this worked but thought I’d put what I just did in case someone else has issues. It was too light for our site too so in the spiritual-gifts-survey/spiritual-gifts-survey.php (lines 101 and 104 on mine) I changed the even and odd background colors and now it shows well; you might need different colors depending on your site but I used .even #272727 and .odd #4b4b4b