`CssClassWidget` story broken

[fregante]

https://pixiebrix-extension-storybook.vercel.app/?path=/story/widgets-cssclasswidget--blank-literal

Input widget TextWidget not set. Did you forget to register it in registerDefaultWidgets?
UnsetWidget@https://pixiebrix-extension-storybook.vercel.app/29614.9f118f59.iframe.bundle.js:2:97000
Ch@https://pixiebrix-extension-storybook.vercel.app/57355.c2579cdf.iframe.bundle.js:2:2321490
ck@https://pixiebrix-extension-storybook.vercel.app/57355.c2579cdf.iframe.bundle.js:2:2373328
bk@https://pixiebrix-extension-storybook.vercel.app/57355.c2579cdf.iframe.bundle.js:2:2360673
ak@https://pixiebrix-extension-storybook.vercel.app/57355.c2579cdf.iframe.bundle.js:2:2360604
Tj@https://pixiebrix-extension-storybook.vercel.app/57355.c2579cdf.iframe.bundle.js:2:2360473
Lj@https://pixiebrix-extension-storybook.vercel.app/57355.c2579cdf.iframe.bundle.js:2:2357498
Jg@https://pixiebrix-extension-storybook.vercel.app/57355.c2579cdf.iframe.bundle.js:2:2354878
lk@https://pixiebrix-extension-storybook.vercel.app/57355.c2579cdf.iframe.bundle.js:2:2370829
@https://pixiebrix-extension-storybook.vercel.app/57355.c2579cdf.iframe.bundle.js:2:2372218
Xj@https://pixiebrix-extension-storybook.vercel.app/57355.c2579cdf.iframe.bundle.js:2:2357866
tk@https://pixiebrix-extension-storybook.vercel.app/57355.c2579cdf.iframe.bundle.js:2:2372203
@https://pixiebrix-extension-storybook.vercel.app/57355.c2579cdf.iframe.bundle.js:2:1238758
Promise@[native code]
_callee$@https://pixiebrix-extension-storybook.vercel.app/57355.c2579cdf.iframe.bundle.js:2:1238655
tryCatch@https://pixiebrix-extension-storybook.vercel.app/57355.c2579cdf.iframe.bundle.js:2:2409440
invoke@https://pixiebrix-extension-storybook.vercel.app/57355.c2579cdf.iframe.bundle.js:2:2409067
asyncGeneratorStep@https://pixiebrix-extension-storybook.vercel.app/57355.c2579cdf.iframe.bundle.js:2:1237522
_next@https://pixiebrix-extension-storybook.vercel.app/57355.c2579cdf.iframe.bundle.js:2:1237842
promiseReactionJob@[native code]