small margin / gap at the top of document

I have come across this before a while back and forgotten what the solution was. I have a s开发者_JAVA技巧mall gap at the very top of my document, maybe 5/10px?

I think you will know what I am talking about, how do i get rid of this?

Thanks

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In your CSS file add this:

html, body { margin: 0; padding: 0; }