Help, how to adjust the spacing on the main page

[TMC_Sherpa]

about half is coming from

<h1 id="indexDefaultHeading"/>

some is coming from .greeting

.greeting {
padding: 0;
margin: 0;
}

clears out a bunch (note: you'll want to put some back on the bottom at least, this is just a demonstration)

your also getting padding from
.centercolumn {
padding: 0;
}
(again, you'll want to put some back at the sides and probably the bottom, just showing where its coming from)