Centre slider on active slide

[graceWeareduo]

This issue may have been raised before, but I'm wondering if anyone knows how to make the active slide be the centre slide? I have the slider set up so that it is centred, with the previous and next images visible on either side. I need them to be faded out until active, so the easiest way to do this is to be able to target the active slide, however I'm finding that the active slide is always sitting over to the right, where the next slide should be. I have tried various methods of centering, including this:

.flexslider .slides > li {display: none; -webkit-backface-visibility: hidden; background-color: #ffffff; text-align: center;} 
.flexslider .slides img {width: auto; display: inline;}

but with no success. Anyone have any clues how to address this? The slider can be seen here:
http://5.133.180.234/~mastercraft/sectors/healthcare/everyman-theatre