Changing font color from gray to black?

I don’t see a quiz on the link you have given.

Here’s an example:

https://healthconstellations.com/stress-survey/

your theme css file:
https://healthconstellations.com/wp-content/themes/Chameleon/style.css
has this:
body {
color: #929292;

just change it to:
body {
color: #000000;

Thanks Daiv!! That change did the trick, now I can see my surveys.

Have a good weekend,
Aarti