Slidebuttons doesnt appear on the startpage

Hi.
Thx for the very nice theme.
I have a small problem. The slider buttons (left, right and bottom) doesnt appear.

I followed your layer slider instruction and activate the slider at the homepage.

If you want to have a look:

http://wordpress.p196950.webspaceconfig.de

If you need something more (login for the backend let me know)

Best regards,

Sung-Bin