BuddyPress.org

Okay I figured it out…I had to change the 960px width to 100% in the style.css file for the lifestyle theme. The new code looks like this and it now works;

#subnav {
width: 100%;
background: #006c9f;
font-family: Arial, Tahoma, Verdana;
font-size: 10px;
font-weight: bold;
color: #FFFFFF;
text-shadow: #333333 1px 1px;
text-transform: uppercase;
clear: both;
overflow: hidden;
}

Thanks everyone for your suggestions.