Ejemplo
Vista Previa
<!doctype html> <html> <head> <title>Prueba de Bootstrap 4</title> <meta charset="utf-8"> <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no"> <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css" integrity="sha384-Gn5384xqQ1aoWXA+058RXPxPg6fy4IWvTNh0E263XmFcJlSAwiGgFAW/dAiS6JXm" crossorigin="anonymous"> </head> <body> <div class="container"> <div class="btn-group btn-group-lg"> <button type="button" class="btn btn-primary">one</button> <button type="button" class="btn btn-primary">two</button> <button type="button" class="btn btn-primary">three</button> </div> <hr> <div class="btn-group btn-group-sm"> <button type="button" class="btn btn-primary">one</button> <button type="button" class="btn btn-primary">two</button> <button type="button" class="btn btn-primary">three</button> </div> </div> </body> </html>
No tiene disponible el navegador la capacidad de iframe