Replacing a Colour with FieldID in CSS

[Brexen]

Hi there.

I would like to make a colour variable in CSS selectable via Profile Fields.

In short, I want to change the following part of my code;

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into;

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So that the value set in ProfileField 2 will become the colour used in the CSS.

I know how to make the List of variables in the Profile Fields however I don't know how to link the Field ID into the CSS.

Normally it would be something like;
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However, I don't think this will work with the CSS. Please correct me if i'm wrong however.