How to set a background color and remove margins?

preguntado 2017-06-03 19:03:54 +0100

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  1. I know how to set the background color but what I don't know is how to set it like.. I set a color but as soon as I save the color becomes default again. So if I for example set it to black in one session, save, and then come back only to find that the color has become white/default as if I never changed it. How do I fix this?

  2. Also, margins seem ugly looking to me. How can I remove them>

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Imagen Gravatar de m.a.riosv m.a.riosv ( 2017-06-04 14:39:53 +0100 )edit