body {
  font-family: sans-serif;
  display: flex;
  flex-direction: column;
  align-items: center;
  margin-top: 50px;
  transition: background-color 0.3s, color 0.3s;
}

.dark-mode {
  background-color: #333;
  color: #fff;
}

#theme-toggle {
  margin-top: 10px;
}

.lotto-set {
  margin: 10px;
  padding: 10px;
  border: 1px solid #ccc;
  border-radius: 5px;
}

.dark-mode .lotto-set {
  border-color: #555;
}