Поменять в CSS теги заголовка страниц с h2 на h1 - Вопросы по CSS

/* begin PostHeaderIcon */
.art-post h2.art-postheader, 
.art-post h2.art-postheader a, 
.art-post h2.art-postheader a:link, 
.art-post h2.art-postheader a:visited, 
.art-post h2.art-postheader a.visited, 
.art-post h2.art-postheader a:hover, 
.art-post h2.art-postheader a.hovered
{
  margin: 0.2em 0;
  padding: 0;
  font-weight: normal;
  font-size: 22px;
  color: #62AC06;
}

.art-post h2.art-postheader a, 
.art-post h2.art-postheader a:link, 
.art-post h2.art-postheader a:visited, 
.art-post h2.art-postheader a.visited, 
.art-post h2.art-postheader a:hover, 
.art-post h2.art-postheader a.hovered
{
  margin: 0;
  text-decoration: none;
  color: #62AC06;
}

.art-post h2.art-postheader a:visited, 
.art-post h2.art-postheader a.visited
{

  color: #62AC06;
}


.art-post h2.art-postheader a:hover, 
.art-post h2.art-postheader a.hovered
{


  color: #62AC06;
}

/* end PostHeaderIcon */

/* begin PostIcons, PostHeaderIcons */
.art-postheadericons
{
  color: #878787;
  padding: 1px;
}

.art-postheadericons, .art-postheadericons a, .art-postheadericons a:link, .art-postheadericons a:visited, .art-postheadericons a:hover
{
  font-size: 11px;
}

.art-postheadericons a, .art-postheadericons a:link, .art-postheadericons a:visited, .art-postheadericons a:hover
{
  margin: 0;
  text-decoration: underline;
  color: #62AC06;
}

.art-postheadericons a:visited, .art-postheadericons a.visited
{

  color: #62AC06;
}

.art-postheadericons a:hover, .art-postheadericons a.hover
{

  text-decoration: none;
  color: #62AC06;
}
/* end PostIcons, PostHeaderIcons */

?>

 <h2 class="art-postheader"> 

<?php

 artxFragmentBegin(ob_get_clean());

 if ($this->params->get('link_titles') && $this->article->readmore_link != '')

  artxFragmentContent('<a href="' . $this->article->readmore_link . '" class="PostHeader">' . $this->escape($this->article->title). '</a>');

 else

  artxFragmentContent($this->escape($this->article->title));

 ob_start();

?>



</h2>