Highlight the Current Page In WordPress Using CSS

style.css

#leftcontent li.current_page_item a:link, #leftcontent li.current_page_item 
a:visited, #leftcontent li.current_page_item a:hover, #leftcontent 
li.current_page_item a:active {
  font-weight: bold;
  color:#FFFFFF;
  padding:0px 0px 0px 7px;
  background-position: 0px 0px;
  background:url(images/li_bg.jpg) no-repeat;
}