[Fix] Adds padding to content in default-page.html

[egbadon-victor]

Fixes

• Fixes [Bug] Mobile responsibility UI issue on default-page.html #68 by @SisiVero

Description

This pull request fixes the responsiveness issues of the content area of default-page.html

Technical details

• Adds padding, defined by the --vocabulary-page-edges-space variable, to the .content class at screen sizes 680px or less

Tests

1. Open the specimen/contexts/default-page.html file in your browser of choice
2. Using chrome developer tools, toggle responsive mode and reduce screen size below 680px
3. Observe that there is adequate padding for content on the page.

Screenshots

Checklist

• My pull request has a descriptive title (not a vague title like Update index.md).
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• My code follows the established code style of the repository.
• I added or updated tests for the changes I made (if applicable).
• I added or updated documentation (if applicable).
• I tried running the project locally and verified that there are no
  visible errors.

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Developer Certificate of Origin

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