const initAlign = () => {
  const cur = localStorage.getItem("align");
  const prev = cur == "center" ? "left" : "center";
  document.body.classList.add("align-" + cur);
  document.body.classList.remove("align-" + prev);
};

if (localStorage.getItem("align") === null) {
  localStorage.setItem("align", "center");
}

initAlign();

const toggleAlign = (ev) => {
  localStorage.setItem(
    "align",
    localStorage.getItem("align") == "center" ? "left" : "center",
  );
  initAlign();
  if (!!ev.target) ev.preventDefault();
  return false;
};