Load Rocket Chat Livechat html with popup maximized

#1
(function(w, d, s, u) { w.RocketChat = function(c) { w.RocketChat._.push(c) }; w.RocketChat._ = []; w.RocketChat.url = u; var h = d.getElementsByTagName(s)[0], j = d.createElement(s); j.async = true; j.src = 'http://my_url:3000/packages/rocketchat_livechat/assets/rocketchat-livechat.min.js?_='+ Math.random(); h.parentNode.insertBefore(j, h); })(window, document, 'script', 'http://my_url:3000/livechat');

RocketChat(function() {
this.setGuestName(‘TEste’);
});

RocketChat(function() {
this.setDepartment(‘SUPORTE’);
});

RocketChat(function() {
this.setGuestToken(‘FRaaijhfbv564654654du’);
});

</script>

I want the popup to be maximized,

Does anyone know how to do it?