Contact form (Margin & maximum characters)

Hello everyone !

I need a little help with the contact form.

As you see, there is a maximum characters for the text field (256)

  1. Do you know if we can upgrade it and where ?

  2. And when you write a message, it does not go to the line but continues on the same, how to fix it?

Thanks everyone!

Here is my public share link: LINK
(how to access public share link)