Customizing contact form submit button

Hello,

On this page: http://yourtechadvisors.com/contact

There is a submit button at the bottom, I would like to do two things to it.

1. Put a black box around the button, and have white text.

2. On hover, I would like to use this color. #ff0000

Can this be accomplished? Support access is open.

Thanks for your wonderful support!!