[3rdthemagical]

Just swap visibility values.

function toggleTheme() {
  const darkThemeBtn = document.getElementsByClassName("theme-toggle-dark")[0];
  const lightThemeBtn = document.getElementsByClassName("theme-toggle-light")[0];

  const darkThemeState = darkThemeBtn.style.visibility;

  darkThemeBtn.style.visibility = lightThemeBtn.style.visibility;
  lightThemeBtn.style.visibility = darkThemeState;
}

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