Read the statement by Michael Teeuw here.
Change size and / or font from different modules ?
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 Hello together, 
 is´s possible to chaneg the size from diff. modules (for example : clock, weather, complinets) ?
 What is neccessary to change that ?
 I want add modules, but i don´t have enough space at the MM.Thanks in advance, 
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 @aldisachen yes, using styles, css, you can change all the content. BUT it is module by module some (the default modules for sure) use the generic styles we provide. see css/main.css each module should document in a css file in their folder how they use those styles the css architecture allows one to override styles later, in MagicMirror by adding info into custom.css. a css entry is selector_clause { styles applied to the elements selected }the selector clause can be simple or complex 
 first char as a dot means class (class= on an html tag)
 as a pound sign means id (id= on an html tag)
 none means an html tag (img, table…)a class holds a collection of styles 
 font-size, color, font, etccss allows you to override styles later one or more styles at a time each module name is used in a class on the surrounding html div of the content the module creates 
 that way you can target just one modules content in their selector with.module_nameif a module doesn’t give a good way to alter its styles you can still select the html elements 
 see the second link in my signature below for an example of how to use the browser developer window elements tab to examine and test style changes to determine what should go in custom.css
