Size of Slideshow

What an excellent and well designed plugin, fantastic work, thank you.

This is a basic question and I have looked for a solution and changed many of the settings to find a answer.

I’ve set a slider up with a couple of images and inserted the shortcode into a page. The images show up perfectly. However the images cover the entire width of the webpage. I would like the slider to be centred on the page, but around 1/2 the width of the webppage. I’m sure there is an easy answer as to how this is done, but I cant find it! Many thanks.