You can choose the size of the spinner by setting the data-size attribute: data-size=xs data-size=s data-size=l.
Many web applications have some kind of loading animation (aka spinner). A loading animation is important to signal the user that the . Loading (Busy) Indicator (Spinner) with Overlay GIF Image is used to display the progress of the jQuery AJAX call and it will be shown to the . I am going to use animated striped progress bar and set its value to 1. The black background is the default for modal dialogs in Bootstrap.