You can remove some of the padding around. I tried 10px and it still looked good. Or, you could consider moving the text accessibility top?
Adjust the padding here: template.css
#horiz-menu a {
display:block;
float:left;
font-family:Arial Narrow,Arial,Helvetica,sans-serif;
font-size:120%;
font-weight:bold;
height:45px;
line-height:45px;
padding:0 17px;
white-space:nowrap;
}
PS Please post template related questions to their respective forum in the future.
Thanks!