JSFiddle - React, Tailwind, and code Playground

JavaScript

localStorage.setItem('primary_h', '300');
localStorage.setItem('primary_s', '100%');
localStorage.setItem('primary_l', '50%');

for (let i = 0; i < localStorage.length; i++) {
		const cle = localStorage.key(i);
		const valeur = localStorage.getItem(cle);
		console.log("--" + cle + ": " + valeur);
  document.documentElement.style.setProperty("--" + cle, valeur);
}