Validation issue

My site xhtml will validate through the wc3 xhtml validator, but the  
css validator fail due to a xhtml error. I can't find this error in  
the source code and don't know why it fails to validate?

www.christie.nhs.uk

Any help greatly appreciated!!
Please, validate your XML document first!

Line 85

Column 26

Element type "div" must be followed by either attribute  
specifications, ">" or "/>".