Remove that <p>
tag and add the button inside a <div class="form-actions">
like this:
<div class="form-actions">
<button type="submit" class="btn">Confirm</button>
</div>
an then augment the CSS class with:
.form-actions {
margin: 0;
background-color: transparent;
text-align: center;
}
Here's a JS Bin demo: http://jsbin.com/ijozof/2
Look for form-actions
at the Bootstrap
doc here: