Between each category name you mean?  That is just a  
 tag in customer/categories.tpl.  You would need to add a padding element to the CategoriesList class to use padding. 
		
	
		
		
		
		
			
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				Padraic Ryan 
Ryan Design Studio 
Professional E-Commerce Development
			 
		
		
		
		
	
		
		
		
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