Changing Check Box Styles in All Slides

Hello,

 

I'm making a quiz using some multi response graded questions. 

After creating the questions, I realised the Check box and the "tick" are too faded. I know how to change the style of them individually, but please tell me there's a way I can change all of them together, throughout the quiz. I'd hate to have to manually go back through all the individual answers of the individual questions to change each one.. :(

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