Site Origin has a great WordPress Theme called Vantage. The only drawback is the large buffer or margin at the top of the page. There’s a lot of unused page space pushing critical content further down the page. The following CSS modification will fix this problem. You can adjust the padding (in pixels) to suite your preference.
header#masthead hgroup {
padding-bottom: 10px !important;
padding-top: 10px !important;
padding-left: 0 !important;
padding-right: 0 !important;
}
.main-navigation {
margin-top: 0 !important;
}