How to adjust the page margin when printing an html view?

How to adjust the page margin when printing an html view?

When I print an html view, there is a 3/4 inch left margin.

How can I override this so that my data prints with only a 1/4 inch margin?

I have not been able to find a way to modify the default css, although I have seen reference to an "external css" capability.

Can anyone point me in the right direction?

~Steve