:root {
  --background-color: #ffffff;
  --text-color: #333333;
  --button-bg: #eeeeee;
  --button-text: #333333;
}

body.dark-mode {
  --background-color: #333333;
  --text-color: #ffffff;
  --button-bg: #555555;
  --button-text: #ffffff;
}

body {
  font-family: sans-serif;
  background-color: var(--background-color);
  color: var(--text-color);
  transition: background-color 0.3s ease, color 0.3s ease;
  margin: 20px;
}

#theme-toggle {
  padding: 10px 15px;
  border: none;
  border-radius: 5px;
  cursor: pointer;
  background-color: var(--button-bg);
  color: var(--button-text);
  transition: background-color 0.3s ease, color 0.3s ease;
  margin-bottom: 20px;
}

#theme-toggle:hover {
  opacity: 0.9;
}