Fix custom themes breaking the welcome demo.

[Qazzian]

Having applied a dark theme to storybook I noticed that the react demo sets the background white but does not set the text color. This resulted in white text (from my custom theme) rendered on a white background. This change will make the text readable

Issue:

What I did

How to test

• Is this testable with Jest or Chromatic screenshots?
• Does this need a new example in the kitchen sink apps?
• Does this need an update to the documentation?

If your answer is yes to any of these, please make sure to include it in your PR.

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[shilman]

Makes sense, thanks for the fix!!!

[shilman]

@Qazzian mind updating the snapshots?

yarn test --core --update

[Qazzian]

I've run the tests locally and I'm not getting any errors with the snapshots.
running yarn test --core --update doesn't change the snapshots.

I've followed the contribution guide for setting up my dev environment, and tried a second time after running a reset.

This is the summary I get after running yarn test

Test Suites: 109 passed, 109 total
Tests:       901 passed, 901 total
Snapshots:   277 passed, 277 total
Time:        247.199s
Ran all test suites in 8 projects.

[Qazzian]

So I've fixed the snapshots.
The only thing that's blocking the merge now is automention.
Is there anything I need to do to help this?

[shilman]

Thanks for taking care of that @Qazzian!!