$(document).ready( function() {
		jQuery('#rons_list').accordion({
			text-align: left;
			active: false,
			header: '.head',
			navigation: true,
			event: 'mouseover',
			fillSpace: true,
			animated: 'easeslide',
		});
	});


<div  style="height:500px;margin-bottom:1em;" margin-right: auto; margin-left: auto; text-align: center>