As you can see you have some margin between the images, which makes their widths effectively bigger a little bit. I see you applied a reset in your css, so this is probably coming from the white space in your html. A quick fix would be to put all the li
and img
on a single line with no spaces or carriage returns between them, like so:
<ul id="css-slider"><li><img src="http://cdn.gtm.net.au/images/catalogue/sp_image_108.jpg" alt="slider"></li><li><img src="http://cdn.gtm.net.au/images/catalogue/sp_image_62.jpg" alt="slider"></li><li><img src="http://cdn.gtm.net.au/images/catalogue/sp_image_59.jpg" alt="slider"></li><li><img src="http://cdn.gtm.net.au/images/catalogue/sp_image_66.jpg" alt="slider"></li></ul>
I know, it's weird.