All modals use Bootstraps CSS and Js, but the CSS is scoped so it should not interfere with a project that does not use it. Modals are easily called with JavaScript, you dont need to place any ...

{shinyalert} lets you easily create pretty popup messages (modals) in Shiny. Modals can contain text, images, OK/Cancel buttons, Shiny inputs, and Shiny outputs (such as plots and tables). A modal can ...