fix: #353 with a temporary override

[adixon-adobe]

We should update this when
adobe/spectrum-css#243 is fixed.

Description

Just a small override to work around some global styling in spectrum-css.

Related Issue

fixes #353

Motivation and Context

How Has This Been Tested?

Compared the doc site locally with sp-checkbox (I did notice some color differences, but the line-height issue is fixed).

Types of changes

• [ x ] Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• [ x ] I have signed the Adobe Open Source CLA.
• [ x ] My code follows the code style of this project.
• [ x ] My change requires a change to the documentation.
• [ x ] I have updated the documentation accordingly.
• [ x ] I have read the CONTRIBUTING document.
• [ x ] I have added tests to cover my changes.
• [ x ] All new and existing tests passed.

[Westbrook]

This will likely change the visual regression this, but I'll be happy to approve this once that's confirmed.

Separately, if you use fixes #353 in the "Related" section of the PR description, merging this should automatically close the issue as well, unless you intend to leave that issue oven until the Spectrum CSS issue is cleared up.

[Westbrook]

👍