XenForo How to change the color of AMS container with extra.less? Thanks

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Please help! I try the answer from Chatgpt . but it doesn't work as my expect

I want to change the color of AMS container with extra.less.
I already asked xenaddons but there are not answers for it

The color of container,the article background of AMS is white.
I want to change the color same as my forum,which is light grey (background-color: #D3D3D3)

AMS



my forum:



many thanks

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