fix: color of contact us form

[Chauhan48]

What does this PR do?

changed the color of Send Message button in contact us form to match the UI

Fixes #1636

Type of change

• Bug fix (non-breaking change which fixes an issue)

How should this be tested?

• Go to home page
• Scroll down to contact us form

Mandatory Tasks

• Make sure you have self-reviewed the code. A decent size PR without self-review might be rejected.

[vercel]

@Chauhan48 is attempting to deploy a commit to the Piyush Garg's projects Team on Vercel.

A member of the Team first needs to authorize it.