Your options are to do this with CSS (using the body's class, which changes depending on what controller is being used) or in the default.master.php template; I recommend the latter.
Edit default.master.php and put an if statement around the panel div based on what controller is being called.
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Edit default.master.php and put an if statement around the panel div based on what controller is being called.
What function would I call in that file that would tell me which controller is being called?