[playground] Fix dark mode in Chrome

[penalosa]

What this PR solves / how to test:

• Chrome uses a dark-mode page for non-html content by default, which was showing as white-on-white

Associated docs issue(s)/PR(s):

• [insert associated docs issue(s)/PR(s)]

Author has included the following, where applicable:

• Tests
• Changeset (Changeset guidelines)

Reviewer is to perform the following, as applicable:

• Checked for inclusion of relevant tests
• Checked for inclusion of a relevant changeset
• Checked for creation of associated docs updates
• Manually pulled down the changes and spot-tested

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[changeset-bot]

⚠️ No Changeset found

Latest commit: b6fcc04

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[github-actions]

A wrangler prerelease is available for testing. You can install this latest build in your project with:

npm install --save-dev https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/runs/6316338662/npm-package-wrangler-4036

You can reference the automatically updated head of this PR with:

npm install --save-dev https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/prs/6316338662/npm-package-wrangler-4036

Or you can use npx with this latest build directly:

npx https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/runs/6316338662/npm-package-wrangler-4036 dev path/to/script.js

Additional artifacts:

npm install https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/runs/6316338662/npm-package-cloudflare-pages-shared-4036

Note that these links will no longer work once the GitHub Actions artifact expires.

---

wrangler@3.10.0 includes the following runtime dependencies:

Package	Constraint	Resolved
miniflare	3.20230922.0	3.20230922.0
workerd	1.20230922.0	1.20230922.0
workerd --version	1.20230922.0	2023-09-22

|

Please ensure constraints are pinned, and miniflare/workerd minor versions match.