Bootstrap 3: How can I horizontally center the navbar collapsed button?

Question

I am talking about the small button on the right:

http://imageshack.us/scaled/thumb/32/7n9i.png

I have tried the following CSS selector, without success:

display: block;
margin: 0 auto;

Answer 1

.navbar-toggle 
{
    float:none;

}   
.navbar-header
{
    text-align:center;
}

See also: How to center a button within a div?

update

maybe set padding-right of the button too:

margin-right: 26px

(15px + half the size of the button)