<a href="#" class="btn btn-primary btn-lg disabled" role="button" aria-disabled="true">Primary link</a> <a href="#" class="btn btn-secondary btn-lg disabled" role="button" aria-disabled="true">Link</a>

bootstrap href button

<button type="button" class="btn btn-primary">Blue</button> <button type="button" class="btn btn-secondary">Grey</button> <button type="button" class="btn btn-success">Green</button> <button type="button" class="btn btn-danger">Red</button> <button type="button" class="btn btn-warning">Yellow</button> <button type="button" class="btn btn-info">Ligth blue</button> <button type="button" class="btn btn-light">White</button> <button type="button" class="btn btn-dark">Black</button> <button type="button" class="btn btn-link">White with blue text</button>

bootstarp btn colors