Making divs go all the way to the top or left

[hiddenbrooknb]

How can I make my divs go all the way to the top of the page with no spacing, and the left of the page?

Thank You Very Much

(I know theres some easy way, but I never learned that)....

[Wickham]

Are you thinking of a 20px space all around your web page?

This is the default body margin that all browsers show unless you delete it with the style
body { margin: 0; }