.container {
  text-align: center;
  margin-top: 50px;
  font-family: Arial, sans-serif;
}
button {
  padding: 10px 20px;
  font-size: 16px;
  background: #007bff;
  color: white;
  border: none;
  border-radius: 6px;
  cursor: pointer;
}
.online { color: green; }
.offline { color: red; }