Fix: coinmarketcap widget dropdown not clickable

[henry40408]

Proposed change

Fix drop-down of CoinMarketCap widget:

Currently, the drop-down is not clickable because its z-index is set to auto, while the title bar (.service-name) of the widget has a z-index of 10 (z-10). As a result, the drop-down is shadowed by the title bar. This pull request sets the z-index of the drop-down to 20 (z-20), the next higher z-index class name I found in TailwindCSS, making the drop-down clickable again.

Type of change

• [ ] New service widget
• [x] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Documentation only
• [ ] Other (please explain)

Checklist:

• [ ] If applicable, I have added corresponding documentation changes.
• [ ] If applicable, I have reviewed the feature and / or service widget guidelines.
• [x] I have checked that all code style checks pass using pre-commit hooks and linting checks.

  
  [nix-shell:~/Develop/homepage]$ date; npm run lint
  Wed Jun  5 15:40:21 CST 2024

startpage@0.1.0 lint next lint

✔ No ESLint warnings or errors

- [x] If applicable, I have tested my code for new features & regressions on both mobile & desktop devices, using the latest version of major browsers.

Tested on Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:126.0) Gecko/20100101 Firefox/126.0

| Desktop | Tablet | Phone |
|--------|--------|--------|
| ![Screen Shot 2024-06-05 at 15 42 41](https://github.com/gethomepage/homepage/assets/2316687/1ef135a3-53c1-475f-b590-efb8f63efd09) | ![Screen Shot 2024-06-05 at 15 44 16](https://github.com/gethomepage/homepage/assets/2316687/7a0bb91c-a76a-4a72-8624-8da964a77100) | ![Screen Shot 2024-06-05 at 15 46 08](https://github.com/gethomepage/homepage/assets/2316687/e52f1b66-7bfe-4524-88eb-c3621c8d05de) |

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