PHP: WP: Enqueue Styles

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// Enqueue stylesheets 
remove_action( 'genesis_meta', 'genesis_load_stylesheet' );
add_action( 'wp_enqueue_scripts', 'zell_load_stylesheets' );

function zell_load_stylesheets() {

	if( !is_admin() ) {
		// Main theme stylesheet
		wp_enqueue_style( 'zell', get_stylesheet_directory_uri() . '/css/style.css', array(), null );

	    // Google Fonts
		wp_enqueue_style(
			'google-fonts',
    		'//fonts.googleapis.com/css?family=Open+Sans:300,400,700,800',		// Open Sans (light, normal, and bold), for example
    		array(),
    		null
    		);

		// Highlight js Styles
		wp_enqueue_style( 'tomorrow-night', get_stylesheet_directory_uri() . '/js/vendor/highlight.js/styles/tomorrow-night.css', array(), null );
	}
}