Migration of Reports from SSRS 2005 to SSRS 2012

Hi,

I have 50 Reports in SSRS 2005 currently in production server. My Client want to migrate to SSRS 2012.
I migrated one RDL using BIDS. I am using list items inside Text Box in those Reports. The Problem is design and style of the Report changed in SSRS 2012.
Borders are not coming correctly.
I want the same Report in 2012 also.

Please suggest what to do?
Appreciate your help.

Regards,
Bala