This increases the padding between the tab text and the edges of tab to 12px. It also darkens the text of the currently selected tab.
/* ----- unselected tab padding ----- */
#CommunityTabs ul li a{
padding-left:12px;
padding-right:12px;
}
/* ----- selected tab padding and text color----- */
#CommunityTabs UL LI.SelectedCommunityTab a, #CommunityTabs UL LI.SelectedCommunityTab a:link{
padding-left:12px;
padding-right:12px;
color:#333;
}