ERROR, cannot go to next step

https://www.codecademy.com/courses/learn-css-box-model/lessons/box-model-intro/exercises/min-max-height-width?action=lesson_resume&course_redirect=learn-css

Tried to run code, No response received from web browser.

Please check the screenshot.

Thanks.

It is possible a network firewall or parental control software is preventing the codecademy browser to load. Make sure to disable this, or create an exception for codecademy.com, and all extensions.

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