https://coreui.io/docs/components/offcanvas/
Bootstrap offcanvas
Build hidden sidebars into your project for navigation, shopping carts, and more with a few classes and our JavaScript plugin.
coreui.io
https://coreui.io/react/docs/components/callout/
React Callout Component
React callout component provides presentation of content in a visually distinct manner. Includes a heading, icon and typically text-based content.
coreui.io
기억하고 있다가.. 용도별로 잘 사용해보자..