This works for me:

"CSS Based System Wide Solution

1) First, navigate to the directory where reporting services is installed, in my case (MSSQL 2012SP1) it is:

C:\Program Files\Microsoft SQL Server\MSRS11.MSSQLSERVER\Reporting Services\ReportServer

In that directory, you will find a file named reportserver.config

see http://msdn.microsoft.com/en-us/library/ms345247(v=sql.110).aspx

In that file insert a single XML line like: (from the above document)

<Configuration>

...

<HTMLViewerStyleSheet>SafariChromeFix</HTMLViewerStyleSheet>

...

</Configuration>

Save that.

2) Next, descend into the Styles directory (C:\Program Files\Microsoft SQL Server\MSRS11.MSSQLSERVER\Reporting Services\ReportServer\Styles)

Make a copy the file named SP_Full.css and name the copy SafariChromeFix.css. At this point, SafariChromeFix.css should be identical to SP_Full.css.

Edit SafariChromeFix.css and add the following lines to the top:

div {

overflow: visible !important;

}

Save it.

Once this is saved, all of the existing reports on this instance of Reporting Services will render on all browsers including Chrome and Safari.

"

Let me Know if it works