Nevermind I got it.  needed to use :<style>main#MainContent, main#MainContent > section > * {background: {{ product.metafields.custom.product_background_color }};}</style>

Hi, many thanks for helping.  I have added the code to the top of the main-product.liquid file and set metafield colours for a few products (reverance and arnika) but it doesnt work.  Any ideas why? 

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Hi We are using Dawn v9 theme and have a separate product page for one of our product types  (roasted-bean-prod). We want to change the background in the Product information section on the product page dynamically.  The colour would be based on a met...