Arrow horizontal bad view in mobile version

Hello,
sorry for my bad English.
The arrows that allow you to slide the manual, in the mobile version, are badly displayed on all mobile devices, android and ios.
I could understand how to fix? This site uses WordPress Mobile Pack version 1.2.5.
can look at this link to realize the problem: https://www.campanile1.com/?page_id=212

Thank you very much anyway.

https://www.ads-software.com/extend/plugins/soliloquy-lite/