Resizing for Larger Modal

Am I missing something in the settings? The form that I have gotten to pop is super small. It’s a box, but I need it to be more of a rectangle. How can I do this in the settings?

If it requires additional CSS, what’s the best way to get it to where I need it?

Below, I’ve linked to the current form in staging, the way the form is supposed to look (currently in production), and the link to the staging site.

Too Small – http://i66.tinypic.com/wj9jzm.png
How it should look – http://i67.tinypic.com/a0dhmo.png
Staging site URL – http://staging.convey20.flywheelsites.com/a-for-testing/

To access the staging site:
convey20
newconveysite2018

Clicking the “Request a Demo” button will pop it.

Thanks for your help!

The page I need help with: [log in to see the link]