<a>
<button>
Just wrap a series of .btns in .btn-group.btn-group-justified.
.btns
.btn-group.btn-group-justified
<div class="btn-group btn-group-justified"> <a class="btn btn-default">Left</a> <a class="btn btn-default">Middle</a> <a class="btn btn-default">Right</a> </div>