Centering the image in slider

How can I center the image in slider?
I'm using SmartPress, but sometimes the photos I use are smaller than the slider box, and I would like to center it... thanks!!!

Anyone? Any ideas?

Hi!
Try to add rule

.fp-slides-items {
right:0 !important;
}

in the style.css

Thanks!! But it didn't worked.. Any other ideas?

Hi!
Could you give us an URL to your website?