You can actually use our Surety Demo Site to see responsive pages. This can be installed in your instance through the Content Xcelerator which is documented here:
https://community.crownpeak.com/t5/DXM-Developer-Knowledge-Base/Crownpeak-Digital-Experience-Managem...
Further the surety demo site is available through github:
https://github.com/Crownpeak/Surety/tree/master/Crownpeak-Content-Xcelerator%E2%84%A0/2019AUG29
Keep in mind that responsive sites are built from the HTML/CSS/JS of the site and not unique to the CMS implementation.
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Ken SnyderVP, Customer Support & Cloud Operations
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