First Post Class

<?php
add_filter( 'post_class', 'be_first_post_class' );
/**
* First Post Class
* Adds a class of 'first' to the first post
*
* @author Bill Erickson
* @link http://www.billerickson.net/code/first-post-class
*
* @param array $classes
* @return array
*/
function be_first_post_class( $classes ) {
global $wp_query;
if( 0 == $wp_query->current_post )
$classes[] = 'first';
return $classes;
}
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class css post