Gmapfp J3_34F - LightBox text color

Hi,
I cant modify the font color of the lightbox text.
It appear for the end users as a light grey font color text on a white background and very difficult to read.

In the gmapfp.css and gmapfp3.css files, I add the following code :

.gmapfp_marqueur {
color: black;
}

Is it correct or is there something else to codify?
Thank you for your help.
Roger

Hi
I have added the codification you provided to me to correct my issue.
No change ...

As I am not aware of CSS files, please find in the attached file what I really need for my End Users.
Regards.
Roger

Thank you
It seems that the issue is partially due to the internet brother used by the End Users.
As an example, with Mozilla Firefox 40.0.3 (the one I use in my computer) the text on the box is light grey with a white background whatever is the .css file codification.
Regards.
Roger