link wasn't working, but hopefully this is your website.
so here's the css for the left panel (#sidebar) and right panel (#content).
for #sidebar change left: 47px; to a larger number (maybe 70px or so).
for #content change right: 180px; to a larger number (maybe 210px or so).
that will reduce the gap, however for the image, are you trying to make it like a background to your about section, on top, or some place else?