bootstrap Info css buttons

On Twitter bootstrap, 4 type of danger button:

info_button_3.0

Large button html code is here :

<button type="button" class="btn btn-info btn-lg">Large button</button>

Default danger button :

 <button type="button" class="btn btn-info">Default button</button>

Small button html code is here :

<button type="button" class="btn btn-info btn-sm">Small button</button>

Extra small button code is here :

<button type="button" class="btn btn-info btn-xs">Extra small button</button>

The bellow image is on Twitter bootstrap 2.3.2 version.

bootstrap-css-info-button