Changing font size using style.css

I am trying to change the font-size or font-family of class valam in style.css but it doesn't work for some reason.

In style.css I have

.valam {

font-weight: bold;
font-size: 1.3em;
font-family: Arial;

}

And in the panels I have this

  $vid = 4; /* <---- put correct vocabulary ID here */
  $class = "valam";
  $items = array();
  $terms = taxonomy_get_tree($vid);
  foreach ( $terms as $term ) {
    $count = taxonomy_term_count_nodes($term->tid);
    
      $items[] = l($term->name,'taxonomy/term/'.$term->tid)." (".$count.")  ".$term->description;
   
  } /* end foreach */
  print '' . theme('item_list', $items, NULL, 'ul', array('class' => $class)) . '';