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    var _timer = setInterval(update, 1000)
    var _box = document.getElementById('container');

    function update(){
        var _smokeDiv = document.createElement('div');
        _smokeDiv.className = 'smoke';
        _box.appendChild(_smokeDiv);
        TweenMax.to(_smokeDiv,50,{ scale:((Math.random() * 50)+10), top:((Math.random() * 30)-500), left:(Math.random() * 300)-150,opacity:0, rotation:(Math.random() * 360)
              });

        var smoken=document.getElementsByClassName('smoke');
        if(smoken.length>=60){
            smoken[59].remove();
        }
    }