[Config] Adding new css configs for snapshots.

[catandthemachines]

Summary:

Issue: LEMS-XXXX

Test plan:

[github-actions]

npm Snapshot

Want to try this PR's changes before it merges? Comment /snapshot below and we'll publish an npm snapshot you can install right away.

[github-actions]

Size Change: 0 B

Total Size: 512 kB

ℹ️ View Unchanged

Filename	Size
packages/kas/dist/es/index.js	20.6 kB
packages/keypad-context/dist/es/index.js	1 kB
packages/kmath/dist/es/index.js	6.31 kB
packages/math-input/dist/es/index.js	98.7 kB
packages/math-input/dist/es/strings.js	1.63 kB
packages/perseus-core/dist/es/index.item-splitting.js	13.3 kB
packages/perseus-core/dist/es/index.js	28.7 kB
packages/perseus-editor/dist/es/index.js	105 kB
packages/perseus-linter/dist/es/index.js	10.3 kB
packages/perseus-score/dist/es/index.js	9.91 kB
packages/perseus-utils/dist/es/index.js	403 B
packages/perseus/dist/es/index.js	196 kB
packages/perseus/dist/es/strings.js	12.9 kB
packages/pure-markdown/dist/es/index.js	1.39 kB
packages/simple-markdown/dist/es/index.js	6.12 kB

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