gooischekookstudio on "change font H1"

I would like to change the H1 in to lettertype "Century Gothic" 11,5
can someone help me?
i have the code below as is
it is website url http://www.gooische-kookstudio.nl

<div class="col col1">
<?php query_posts('pagename=kookworkshops'); ?>
<?php while (have_posts()) : the_post(); ?>
<h1 class="entry-title"><a>" rel="bookmark" title="<?php the_title(); ?>"><?php the_title(); ?></a></h1>
    <a>" class="content" rel="bookmark" title="<?php the_title(); ?>"><?php echo get_my_excerpt(); ?></a>
<a href="/kookworkshops">» Lees meer</a>
    <a>" rel="bookmark"><?php the_post_thumbnail('thumbnail', array('class' => 'alignleft')); ?></a>
<?php endwhile;?>
</div>