Forces custom styling of menu buttons

[apdsrocha]

Fixes

The buttons in the menu were not displaying correctly (still pulling from standard styling instead of customized styles).

Description

Button styles were being over-written by the standard vocabulary settings, so I altered the styling in a custom class to force the correct button styling in this custom menu

Checklist

• My pull request has a descriptive title (not a vague title like Update index.md).
• My pull request targets the master branch of the repository.
• My commit messages follow best practices.
• My code follows the established code style of the repository.
• I added 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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[TimidRobot]

deployed to staging environment