Hi i am wondering if someone would be able to help me with this simple yet hard to find anywhere question/answer.

I have my main content and a right sidebar that i would like to show only if there is a modual in the right side. other wise i want it the main content to be 100%

if the right side is active i want the main content to be 80% and 20% for the right side.

Thanks
Russell Harrower