How to apply Style and effect on ink filepicker through Javascript

Question

I am stucked on filepicker.io API from long days that how do i add style/css through javascript in ink filepicker. I have also idea about i can add style to my ink filepicker from my account also but i have two filepicker.io on my same page i just want to change style for only one dialog so is there any way to do it.

        filepicker.pick({ mimetype: "image/*" }, function (InkBlob) {     
                                        json = InkBlob;    
                                        var InkbolobFilename = json.filename; 
                                        var InkbolobUrl = json.url; 
                                    });

This my code snap so please help me out where i can add my css url.