How to I get rid of margins at the top & bottom?

[johnsonholding]

I am making a web page with lines that run 100% in height to the top
and bottom of the page (vertically), but there seems to be a gap at the
top and bottom where the lines disappear - is this the margins? Can I
get rid of them? Thanks

 

[dorayme]

I am making a web page with lines that run 100% in height to the top
and bottom of the page (vertically), but there seems to be a gap at the
top and bottom where the lines disappear - is this the margins? Can I
get rid of them? Thanks

It could be padding. Time for you know what... a URL to show your
efforts...