ZUsing Reportviewer with Visual studio 2013 and SSRS 2008 I am facing issue where multi value parameter, calendar and show/hide parameter dropdown looking awfully big. I don't have access to Report server , so can't change css or any setting there.Here is a screenshot for the same. Not sure how to resolve this now.
Show/Hide Parameter drop down looking aweful
Calendar Parameter icon looking very big and similar is the case with multi value parameters
I got the answer from another post by Mike, Thanks Mike. ReportViewer (SSRS) with VB.NET Appearance error
Basically, you need to remove the section Mike has mentioned in his post from Site.css file which is default stylesheet file with your web project and you are done.