React Form reload page after adding Style

reactjs react-final-form

It's not about styling, but about your generated HTML structure. FormContainerPart is a form so when you're submitting your form (by clicking the button) you're submitting your Form from react-final-form AND your form from FormContainerPart.

And as you're not catching the onSubmit handler on your form by FormContainerPart, well it goes to default navigator behavior, which is: reload the page

So, as there is no need for FormContainerPart to be a form just change your styled to

export const FormContainerPart = styled.div`
...
`

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