Read the statement by Michael Teeuw here.
is custom.css only for default modules?
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 Hey - n00b question, I’ve tried doing calling modules such as MMM-MoonPhase to position them exactly and create custom backgrounds for that specific module through custom.css but I can’t get it working… Should I be editing only the modules CSS file? The position and the background are probably separate issues to tackle right? .module.MMM-MoonPhase { position: absolute; left : 400px; top : 100px; background: #545454; }
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 @cluelesscarter only edit the custom.css custom.css is for everything. last stylesheet loaded so it can override anything before it remove the .module should start with the full module name 
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 @sdetweil How can I use Bootstrap on 3rd Party Modules?? 
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 @ShuraimHassan what is bootstrap? 
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 @sdetweil What do you mean? Are you not Front end or Full stack Developer?? 
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 @ShuraimHassan no… 
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 @sdetweil Bootstrap is a potent front-end framework used to create modern websites and web apps. It’s open-source and free to use, yet features numerous HTML and CSS templates for UI interface elements such as buttons and forms. Bootstrap also supports JavaScript extensions. 
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 @ShuraimHassan but like anything else, u install it and for those modules that expose their icon usage, you either change the config or use css to override. each module gets to do its own thing, so u have to fiddle with each one separately… most use font-awesome icons… 
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 @ShuraimHassan each module provides a block of html in a div wrapper. 
 the MM runtime positions the block of content where u configured it. (see index.html for the layout)you can also use javascript api calls to create the content that is returned to MM on the getDom() routine. i would say probably >95% of the MM implementations are output only … (as its a ‘mirror’ hanging on the wall, probably 95% of the other 5% are voice based as many are behind shaded glass, the cool color front ends don’t display well, and aren’t particularly helpful to this kind of environment… … 
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 @sdetweil could you show me an Example that how Can I do this? Thanks in Advance 
