JSFiddle - React, Tailwind, and code Playground

by userdude

HTML

<div id="margin">Foo</div>

CSS

div#margin { 
    background-color:red; 
    height:100px; 
}

JavaScript

$().ready(function(){
    alert($('#margin').height());
    var margin = $('#margin').height()/4;
    $('#margin').css('margin-bottom',margin);
    alert($('#margin').css('margin-bottom'));
});