Change send button and form tipography

Hello.
Its possible only inside of the CSS.
You can add this CSS to the calendar skin file, which you was selected on the General Booking Settings page (the calendar skins located in the ../booking/css/skins/ folder). Or you can add this CSS to the ../booking/css/client.css file

You can change send button color by adding this css to the bottom of one of those CSS files:

.booking_form input[type="button"],
.booking_form input[type="submit"] {
 background-color: #ccc;
}

You can apply the CSS to the entire booking form, by using this CSS:

.booking_form {
 ... YOUR CSS HERE ...
}