Shoestrap 3 - remove jumbotron paddings whenever a widget is on

functions.php

<?php

function add_jumbotron_paddings() {
	if ( dynamic_sidebar('jumbotron') && is_active_sidebar('jumbotron') ) {
		$custom_css = "<style>.jumbotron{ padding-left: 0px; padding-right: 0px; padding-bottom: 0px; }</style>";
    		echo $custom_css;
	}
}
add_action( 'wp_head', 'add_jumbotron_paddings' );