<input class="btn btn-primary btn-lg" type="button" value="Grande">
<input class="btn btn-primary" type="button" value="Por defecto">
<input class="btn btn-primary btn-sm" type="button" value="mediano">
<input class="btn btn-primary btn-xs" type="button" value="Pequeño">

External CSS

  1. //maxcdn.bootstrapcdn.com/bootstrap/3.3.4/css/bootstrap.min.css

External JavaScript

This Pen doesn't use any external JavaScript resources.