Rocketchat night theme

rocketchat-night-theme.js

var iconNightMode = document.createElement('i');
iconNightMode.className='icon-toggle-off';
var btnNightMode = document.createElement('div');
btnNightMode.className="tab-button";
btnNightMode.id = 'toggle-nightmode';
btnNightMode.title = 'Toggle night mode';
btnNightMode.appendChild(iconNightMode)
$('.flex-tab-bar').append(btnNightMode)
var rocketChatContainer = $('#rocket-chat');
rocketChatContainer.toggleClass('theme-night', !!JSON.parse(localStorage.getItem('nightmode')));
$('#toggle-nightmode').unbind('click').click(function(){
  var $this = $(this);
  rocketChatContainer.toggleClass('theme-night');
  var isNight =  rocketChatContainer.hasClass('theme-night')
  $this.find('i').toggleClass('icon-toggle-on', isNight).toggleClass('icon-toggle-off', !isNight);
  localStorage.setItem('nightmode', isNight);
});