Header Top Margin

I am trying to get my header to not have the top margin.

I can find the location of the code though to change it.

media="screen"
html {
margin-top: 28px !important;
}

Where is this located? I looked all over and never had trouble finding code before.

When checking with firebug and Chrome editor it points to…

mysite.com:39

???

Any help is appreciated.

Thanks,

Nimo1