Darken website background when drawer cart active similar to Allbirds.com

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Hello! I'm looking to achieve a look similar to Allbirds.com (shown in the image below) in the Brooklyn theme. They've created an overlay with an opacity value when the drawer cart is active. Any help anyone can provide would be greatly appreciated!


Screen Shot 2019-09-03 at 7.46.12 PM.pngDarkened background with drawer active