Retrieve category ID from a post

  • Hi

    I want to retrive the Category ID from a post -just like the the_title(); etc. I need it to style specific categories in css:

    body#1 {color #000000;}
    body#2 {color #ffffff;}
    body#3 {color #fe0000;}

    etc…

    So i need the ID from a posts category i can put into my html <body id=”CATEGORY_ID”>.

    But how can that be done? I’ve tried many things, but still no luck ??

    Hope you can help.

    Claus

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