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<!DOCTYPE html>
<html lang="en">
<meta charset="UTF-8">
<title>Scoped CSS Variables and JS</title>
<h2>Update CSS Variables with <span class='hl'>JS</span></h2>
<div class="controls">
<label for="spacing">Spacing:</label>
<input id="spacing" type="range" name="spacing" min="10" max="200" value="10" data-sizing="px">
<label for="blur">Blur:</label>
<input id="blur" type="range" name="blur" min="0" max="25" value="10" data-sizing="px">
<label for="base">Base Color</label>
<input id="base" type="color" name="base" value="#ffc600">
<img src="">
:root {
--base: #ffc600;
--spacing: 10px;
--blur: 10px;
img {
padding: var(--spacing);
background: var(--base);
filter: blur(var(--blur));
.hl {
color: var(--base);
misc styles, nothing to do with CSS variables
body {
text-align: center;
background: #193549;
color: white;
font-family: 'helvetica neue', sans-serif;
font-weight: 100;
font-size: 50px;
.controls {
margin-bottom: 50px;
input {
const inputs = document.querySelectorAll('.controls input');
function handleUpdate() {
const suffix = this.dataset.sizing || '';`--${}`, this.value + suffix);
inputs.forEach(input => input.addEventListener('change', handleUpdate));
inputs.forEach(input => input.addEventListener('mousemove', handleUpdate));