add_action('customize_controls_print_footer_scripts', function(){?>
	<script type="text/javascript">
	( function ( wp, $ ) {
		console.log($("#save"))
		var btn = $("<button style='margin-right: 5px' class='button button-primary'>Reload CSS</button>").click(function(e){
			e.preventDefault(true);
			wp.customize.previewer.preview.iframe.get(0).contentWindow.reloadStylesheets();
		});
		$("#save").after(btn);

	})( window.wp, jQuery );
	</script>
<?php }, 9999);

if(is_customize_preview())
{
    add_action('wp_footer', function(){ ?>
            <script type="text/javascript">
            function reloadStylesheets() {
                var queryString = '?reload=' + new Date().getTime();
                jQuery('link[rel="stylesheet"]').each(function () {
                    this.href = this.href.replace(/\?.*|$/, queryString);
                });
            }
            </script>
        <?php
    });
 }