body.dark-mode {
  background-color: #121212;
  color: #e0e0e0;
  transition: background-color 0.4s, color 0.4s;
}

.dark-toggle {
  position: fixed;
  bottom: 20px;
  right: 20px;
  background: #333;
  color: #fff;
  padding: 10px 15px;
  border-radius: 25px;
  cursor: pointer;
  font-size: 18px;
  z-index: 9999;
}

body.dark-mode .dark-toggle {
  background: #fff;
  color: #000;
}