Fixed width buttons with Bootstrap

You can also use the .btn-block class on the button, so that it expands to the parent’s width.

If the parent is a fixed width element the button will expand to take all width. You can apply existing markup to the container to ensure fixed/fluid buttons take up only the required space.

<div class="span2">
    <p><button class="btn btn-primary btn-block">Save</button></p>
    <p><button class="btn btn-success btn-block">Download</button></p>
</div>

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>
<link href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet" />


<div class="span2">
  <p><button class="btn btn-primary btn-block">Save</button></p>
  <p><button class="btn btn-success btn-block">Download</button></p>
</div>