Normal
<button type="submit" class="btn">Regular</button>
<button type="submit" class="btn btn-primary">Primary</button>
<button type="submit" class="btn btn-success">Success</button>
<button type="submit" class="btn btn-info">Info</button>
<button type="submit" class="btn btn-warning">Warning</button>
<button type="submit" class="btn btn-danger">Danger</button>
<button type="submit" class="btn" disabled>Disabled</button>
Small
<button type="submit" class="btn btn-sm">Regular</button>
<button type="submit" class="btn btn-primary btn-sm">Primary</button>
<button type="submit" class="btn btn-success btn-sm">Success</button>
<button type="submit" class="btn btn-info btn-sm">Info</button>
<button type="submit" class="btn btn-warning btn-sm">Warning</button>
<button type="submit" class="btn btn-danger btn-sm">Danger</button>
<button type="submit" class="btn btn-sm" disabled>Disabled</button>
Block
<button type="submit" class="btn btn-primary btn-block">Primary</button>
<button type="submit" class="btn btn-success btn-block">Success</button>