using twenty ten

I’d like the nav bar to be shorter on the left…. even more….
anyone know which part of the code to tweak? http://emilymckay.com/

#access {
background: #d73a4d;
display: block;
float: left;
margin: 0 auto;
width: 980px;
}
#access .menu-header,
div.menu {
font-size: 15px;
margin-left: 180px;
width: 860px;
}

thanks