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/* Change the font size and center the site description */
.site-description {
	font-size: 50px;
	font-weight: 300;
	line-height: 1.5;
	text-align: center;
}

<?php

//* Remove the site description
remove_action( 'genesis_site_description', 'genesis_seo_site_description' );

//* Add the site description conditionally
add_action( 'genesis_before_content', 'maybe_site_description' );
function maybe_site_description() {

	if ( is_home() ) {
		genesis_seo_site_description();
	}

}