$('.drop').droppable({
    tolerance: 'fit'
});

$('.drag').draggable({
    containment: "parent",
    snap : true,
    revert: 'invalid',
    stop: function(){
        $(this).draggable('option','revert','invalid');
    }
});
$('.drag').resizable({
	animate: true,
	helper: "resizable-helper"
});

$('.drag').droppable({
    greedy: true,
    tolerance: 'intersect',
    drop: function(event,ui){
        ui.draggable.draggable('option','revert',true);
    }
});