Font colour issue

Hey,

For my website I have a black lettered menu, which changes to green when hovering.

For the contact form, I can’t see the word ”send”, and if I mess around with the settings so that I make the word ”send” visible, it interferes with my menu (the menu then also changes to black when highlighting the options).

Is there a way that I can change the colouring of the letters for the contact form?

I am completely new to WordPress, so I don’t know about coding etc, but I hope you can help.

the website I am creating is: thegreenvegans.com – – – you will see the problem under the ‘contact’ tab