I'm trying to create an effect where the page around & behind a dropdown menu darkens after the user clicks on the item. Here's an example: http://www.marksandspencer.com/c/women.
If you click on the women item, a mega menu appears and the rest of the page darkens to provide important contrast. Thanks to help from past forum convos, I was able to create a mega menu. However, I don't know how to make the rest of the page darken.
I'm new to this and don't know how to code. Any assistance would be greatly appreciated.
Many thanks! This product & community has been extremely helpful.