css - Apply styles to _root based on JSON object -

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this json object. 

{   "group": "+display",   "name": "card skin",   "description": "wraps article in card skin.",   "hidden": false,   "id": "skintoggle",   "required": true,   "fieldtype": "boolean",   "defaultvalue": false },

what i'd have happen style below applied when card-skin object selected. 

_root {     padding: 0; }

======================

i know 

<c:if test="${custom.skintoggle eq true}">     <c:set var="cardskinpadding" value=" card-skin-padding " /> </c:if>

but i'm having trouble wrapping head around how i'd apply _root.

any appreciated, thank you.


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