Removing Borders from Question Cards

I apologize in advance if this question has already been answered, however I could not find any information about it, so I am asking my question here ( 0.49.7 version):

Is it possible to remove the borders (demarcation lines) from the question cards? For example, how can I remove them when adding a Heading?

I have attached an illustrative example.

Thank you so much in advance.

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Thank you!