[BUG-FIX] Status check tooltip visibility, Re: #39

[Lissy93]

Please check the type of change your PR introduces:

• Bugfix

Issue Number (if applicable): #39

Briefly outline your changes:
The tooltips for status indicators were not visible in some themes. Fixed it by adding custom CSS variable so that themes can target the element correctly, and also added a class name so that the Material theme did not set display: none to the status indicator tooltip.

Before submitting, please ensure that:

• Must be backwards compatible
• All lint checks and tests must pass
• If a new option in the the config file is added, it needs to be added into the schema, and documented in the configuring guide
• If a new dependency is required, it must be essential, and it must be thoroughly checked out for security or efficiency issues

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