Cannot reduce height of check boxes/radio buttons lesser than 43 pixels

I have an e-learning where i need to have check boxes really close to each other. Problem is, the hover state of the boxes is so "wide" that its not really comfortable and some times the adjacent boxes get selected. 

Spacing them out is really not an option so is there a way to get the height of the check boxes lower than the 43 PX it will go? 

Ive already tried putting zeros in the text box in the format menu, lowering it manually, but it just wont go below 43 pixels. 

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