fullscreen form… or minimum 80%?

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I can’t force popup window to make it fullscreen. I am using Fancybox to create contact form 7 window. Take a look at my code:

<a class="zglos fancybox" href="#contact_form_pop">Zgłoś</a>
<div class="fancybox-hidden" style="display: none;"><div id="contact_form_pop">[contact-form-7 id="689" title="Zgłoś"]</div></div>

I would like to make it fullscreen or minimum 80-90% width/height of screen. It is possible?