Change color of the label "for rent"

Good morning,
i would like to change the background color of the label "for rent" applied on the preview of the properties in the random module (now is light green).. Which file do i have to edit? I tried to edit the files: root > modules > mod_ospropertyrandom > tmpl > default.php and showcase.php but it seems that there isn't a code about that color. Where do i find it?
Otherwise, is it possible to change that color by the custom CSS in the property component configuration?
Thanks

Hi Albert,
Please send me the screenshot of the labels that you want to change color.
Thanks
Dam

Hi Dam,
i enclose the screenshot.
I would like to change the background green color to a light blue but only for the properties for rent (in affitto).
Thanks