In cropperjs, background color does not change after cropping the image and I can't crop images round about cropper HOT 2 CLOSED

var cropper = $("#canvas1").cropper({
                    aspectRatio: 1 / 1,
                    strict: false,
                    guides: false,
                    dragCrop: false,
                    resizable: false,
                    mouseWheelZoom: false,
                    touchDragZomm: false,
                    autoCropArea: 0.5,
                    scalable: false,
                    cropBoxMovable: true,
                    cropBoxResizable: false,
                    setDragMode: 'crop',
                    minCanvasWidth: 25,
                    rotatable: true,
                    center: true,
                    modal: true,
                    viewMode: 0,
                    dragMode: 'move',
                    minContainerWidth: 200,
                    minContainerHeight: 100,
                    built: function () {
                        $(this).cropper('getCroppedCanvas').toBlob(function (blob) {
                            fillColor: '#fff'
                        });
                    }
                }
)

 .cropper-crop-box, .cropper-view-box {
            border-radius: 50%;
        }

 .cropper-view-box {
            box-shadow: 0 0 0 1px #39f;
            outline: 0;
        }