Centering the image

I have the same problem.
<p style=”text-align: center;”>[virtual_slide_box id=”1″]</p> It does not work.

#slider {
float: none;
width: auto;
display: block;
margin-left: auto;
margin-right: auto
}

<div id=”slider”>[virtual_slide_box id=”1″]</div>

The next day it was all responsive and centered. All works fine.
Thanks

guys this css does not work, other solution?