CSS assistant required to make some text darker

Can you please help me with some CSS, the text on the gallery page at the bottom of each image

One the booking step form when the guest types in the guest details

And finally the slider on the homepage green trans background needs to be darker so the white text is easier to see

It looks fine on my Mac however on less quality screens you can barely read it so if you can help me out with some CSS that would be greatly appreciated.

I have given you access, cheers Kinnear