Problems with Adding H1 Tags

I'm trying to add H1 tags to my site for SEO purposes. The problem I'm having is that when I add it, the blog title font size gets modified and I
wanted to keep it the same size and style as it is now.

So, I modified the header.php file to add it here:

--- original code

<div id="header">
<div id="logo"><a href="<?php echo get_option('home'); ?>/">
<?php bloginfo('name'); ?></a><span class="description"><?php bloginfo('description'); ?></span></div>

--- modified code

<div id="header">
<div id="logo"> <h1> <a href="<?php echo get_option('home'); ?>/">
<?php bloginfo('name'); ?></a> </h1> <span class="description"><?php bloginfo('description'); ?></span></div>


Here's the source of my WP theme:
http://www.webdesignlessons.com/dynablue-wordpress-theme/

Here's my blog url:
http://tinyurl.com/yfpejf3


Any Advice Appreciated

George

 

try... find this in the .css file:

#header #logo {

Code (markup):

and change it to

#header #logo h1 {

Code (markup):

 

<h1> is a block element, after modified the description should start another line