problem with centring the slideshow

Hello,
I'm working on joomla 2.6 and I created a slideshow with ck
I have a problem with centring my slideshow
when I zoom at 30% for exemple the slideshow is on the left
And when I look at my website on a big screen (1600x1050 for example) the pictures are cutted
On the administration board I put for the pictures width: auto and height:401px
I put you the link for my website.
thanks for your help.
gléglé

Hi
have you tried to set the height in % like explained already here and in the module documentation ?
CEd

Hi
yes I did but it doed not do anything

please give me your url

here is my url
souriezvouscuisinez.fr/
Thank you
gléglé

for now the height is 401px. Put it as % (image ratio height/width)