what is jumbotron in bootstrap
A jumbotron indicates a big box for calling extra attention to some special content or information.
A jumbotron is displayed as a grey box with rounded corners. It also enlarges the font sizes of the text inside it.
Tip: Inside a jumbotron you can put nearly any valid HTML, including other Bootstrap elements/classes.
Use a <div> element with class .jumbotron to create a jumbotron