Uncaught Error: The `style` prop expects a mapping from style properties to values, not a string. For example, style={{marginRight: spacing + 'em'}} when using JSX.

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Disgruntled Old Man Me:

Back in my day the only property that any attribute would take is a string.

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and for fun, this is the line of code that threw the error:

<div style="margin: 0 auto;">

and what it wants me to do is:

<div style={{margin: "0 auto"}}>