Change color based on the score

I am using thumbs Up/Down.
I want to set the color green if the score is greater than 60. The color red if the score is less than 60.

I tried this code , but it is incomplete . You know how?

$colore="<b style=\"color:#00FF00 ;\">";//green text
if($post_ratings_percentage < 60){
    $colore="<b style=\"color:#FF0000 ;\">";//red text
}

my site: http://www.giocare-online-gratis.it/evito-ball/

https://wordpress.org/plugins/wp-postratings/