<button id="css_toggle" title="I'm a tooltip!">Text</button>
<div class="sq"></div>

$('#css_toggle').click(function () {
  $('link[href="http://localhost:8888/rip-access/wp-content/themes/RIP/assets/css/style.css"]').attr('href', 'http://localhost:8888/rip-access/wp-content/themes/RIP/assets/css/style1.css').toggle();
});