lloiser

you could also add the following code into your constructor

if (!(this instanceof Button)) {
  return new Button(text, callback);
}

this automatically creates a new instance if you call Button("test", ...) without the new keyword

instead of calling jQuery you should cache these elements outside your resize event handler. traversing a large dom might be inefficient so doing it only once might improve the performance!

var $window = $(window);
var $container = $('.container');
var $centerContainer = $('.centered-container');
// you should also cache the size of the centered container if its size never changes
// var centerContainerWidth = $centerContainer.outerWidth();
// var centerContainerHeight = $centerContainer.outerHeight();

$window.resize(function(){
  var windowWidth = $window.width();
  var windowHeight = $window.height();

  $container .css({
    height: windowHeight,
    width: windowWidth 
  });

  $centerContainer.css({
    position: 'absolute',
    left: (windowWidth - $centerContainer.outerWidth()) / 2,
    top: (windowHeight - $centerContainer.outerHeight()) / 2
  });
});

$window.resize();