<button type="button" class="btn btn-default">
    Default</button>
<button type="button" class="btn btn-primary">
    Primary</button>
<button type="button" class="btn btn-success">
    Success</button>
<button type="button" class="btn btn-info">
    Info</button>
<button type="button" class="btn btn-warning">
    Warning</button>
<button type="button" class="btn btn-danger">
    Danger</button>
<button type="button" class="btn btn-link">
    Link</button>

<button type="button" class="btn btn-primary btn-lg">
    Large button</button>
<button type="button" class="btn btn-default btn-lg">
    Large button</button>
<button type="button" class="btn btn-primary">
    Default button</button>
<button type="button" class="btn btn-default">
    Default button</button>
<button type="button" class="btn btn-primary btn-sm">
    Small button</button>
<button type="button" class="btn btn-default btn-sm">
    Small button</button>
<button type="button" class="btn btn-primary btn-xs">
    Extra small button</button>
<button type="button" class="btn btn-default btn-xs">
    Extra small button</button>

<button type="button" class="btn btn-lg btn-primary" disabled="disabled">
    Primary button</button>
<button type="button" class="btn btn-default btn-lg" disabled="disabled">
    Button</button>