Column background Opacity

Hi, I am wanting to change the column background color opacity on the site: http://mfeltd.wpengine.com/

For example: The box with "Trusted Seafood Distributors", I want to change that box's opacity to 50% so the background photo of the seafood would show through. Please show me how to achieve this. I need to do this throughout the site.

Thank you!
Cindy

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