text: var themes = document.getElementById("theme-choices");
  var themePicker = document.getElementById("theme-picker");
  
  function switchThemeButtonState() {
      if (themes.style.display === "block") {
          themes.style.display = "none";
          themePicker.style.borderBottomRightRadius = "3px";
          themePicker.style.borderBottomLeftRadius = "3px";
      } else {
          themes.style.display = "block";
          themePicker.style.borderBottomRightRadius = "0";
          themePicker.style.borderBottomLeftRadius = "0";
      }
  };
  
  function handleThemeButtonsBlur(e) {
      var active = document.activeElement;
      var related = e.relatedTarget;
  
      if (active.id !== "themePicker" &&
          (!active.parentNode || active.parentNode.id !== "theme-choices") &&
          (!related ||
              (related.id !== "themePicker" &&
                  (!related.parentNode || related.parentNode.id !== "theme-choices")))) {
          switchThemeButtonState();
      }
  }
  
  themePicker.onclick = switchThemeButtonState;
  themePicker.onblur = handleThemeButtonsBlur;
  ["dark", "light"].forEach(function (item) {
      var but = document.createElement('button');
      but.innerHTML = item;
      but.onclick = function (el) {
          switchTheme(currentTheme, mainTheme, item);
      };
      but.onblur = handleThemeButtonsBlur;
      themes.appendChild(but);
  });