The Modal plugin is a dialog box/popup window that is displayed on top of the current page:
The "Trigger" part:
To trigger the modal window, you need to use a button or a link.
Then include the two data-* attributes:
The "Modal" part:
The parent <div> of the modal must have an ID that is the same as the value of the data-target attribute used to trigger the modal ("myModal").
The .modal class identifies the content of <div> as a modal and brings focus to it.
The .fade class adds a transition effect which fades the modal in and out. Remove this class if you do not want this effect.
The attribute role="dialog" improves accessibility for people using screen readers.
The .modal-dialog class sets the proper width and margin of the modal.
The "Modal content" part:
The <div> with class="modal-content" styles the modal (border, background-color, etc.). Inside this <div>, add the modal's header, body, and footer.
The .modal-header class is used to define the style for the header of the modal. The <button> inside the header has a data-dismiss="modal" attribute which closes the modal if you click on it. The .close class styles the close button, and the .modal-title class styles the header with a proper line-height.
The .modal-body class is used to define the style for the body of the modal. Add any HTML markup here; paragraphs, images, videos, etc.
The .modal-footer class is used to define the style for the footer of the modal. Note that this area is right aligned by default.
Change the size of the modal by adding the .modal-sm class for small modals or .modal-lg class for large modals.
Add the size class to the <div> element with class .modal-dialog: