add class to form

You can add an id and class to a form by adding the html_id and html_class attributes into a [contact-form-7] shortcode.

Example: [contact-form-7 id="1234" title="Contact form 1" html_id="contact-form-1234" html_class="form contact-form"]

Thanks for replying buzztone.
The thing is, now I get this message: [contact-form-7 404 “Not Found”]
Probably because I am also using this plugin: https://www.ads-software.com/plugins/email-before-download/
And the shortcode ends up being different from what you suggested.
Something like this:
[email-download download_id=”00″ contact_form_id=”1234″]
And with this situation html_class doesn’t work. Sorry I didn’t specified this before.

What I need is to have a contact form, and when the user submits it: the form hides and it shows the sent-ok message and a link to download a pdf file (now using Download Monitor plugin for this feature).
So, if you know another workaround in which I can only use Contact Form 7 to do this. I would be glad to try it!