let random_theme = [ ["#c31432", "#240b36"], ["#ad5389", "#3c1053"], ["#2e1c30", "#937898"], ]; function rand(items) { return items[~~(items.length * Math.random())]; } let random_color = rand(random_theme); document.documentElement.style.setProperty("--left", random_color[0]); document.documentElement.style.setProperty("--right", random_color[1]); function darkmode() { var element = document.body; element.classList.toggle("dark-mode"); }