The image module has a lightbox option, but if you add an image to a text module, or to the text field of other modules, it doesn't automatically create a lightbox. To solve this, **Link to the Media file** in the image details and add the following to the 'Link CSS

Class’ field: et_pb_lightbox_image

{width="4.763228346456693in" height="3.1508081802274717in"}