I want to increase the width of my pop ups which use

Hi: I want to increase the width of my pop ups which use the Cabriolet theme. Where and how do I set the width of pop up? You can see it in action of this page: http://shobhaponnappa.com/content-for-customers-versus-content-for-influencer-outreach/

Thanks and regards,

Shobha Ponnappa