1const btn = document.querySelector(".theme-toggle");
 2const prefersDarkScheme = window.matchMedia("(prefers-color-scheme: dark)");
 3
 4const currentTheme = localStorage.getItem("theme");
 5if (currentTheme == "dark") {
 6  document.body.classList.toggle("dark-theme");
 7} else if (currentTheme == "light") {
 8  document.body.classList.toggle("light-theme");
 9}
10
11btn.addEventListener("click", function () {
12  if (prefersDarkScheme.matches) {
13    document.body.classList.toggle("light-theme");
14    var theme = document.body.classList.contains("light-theme")
15      ? "light"
16      : "dark";
17  } else {
18    document.body.classList.toggle("dark-theme");
19    var theme = document.body.classList.contains("dark-theme")
20      ? "dark"
21      : "light";
22  }
23  localStorage.setItem("theme", theme);
24});
25