How to change the color of the contact form button

Hi,
How could I change the button on the contact form?
Thank you!

Hi,

Please share your site URL here.

Regards,

https://www.b2iconsulting.kessianeves.com

Thankyou!

Here you go:

.wpcf7-form .contact-lawer-form .wpcf7-submit {
    background-color: black;
    border-color: black;
}

You can change your desire color from the code above.