Recipe Box feedback
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The Add recipe button has pointer cursor for the whole width, but only + element is clickable.
All fields accept strings with just whitespace, which results in an empty recipe. Confusing.

In RecipeList.js you have key on the wrong element.

Take a look at Prettier: (your code lack consistency in formatting and therefore is hard to read).

_=>props.modify(i) why _? are you saving characters?

I linted all the code using a linter, now.