Removing rounded corners on Multiple Choice questions

Hello, 

I am in the progress of working on a custom designed quiz and noticed that the default text boxes in Multiple Choice questions have rounded corners. There is no yellow box to change the corner radius on these, and I was wondering if it is possible to make the corners square. I attached an image detailing the issue. 

*I tried adding a shape under the the text, but doing this did not display the state changes of the shape properly.

 

Thanks

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