body {
  margin: 0;
  padding: 0;
  font-family: Arial, sans-serif;
  background: #f5f7fa;
  display: flex;
  align-items: center;
  justify-content: center;
  height: 100vh;
}

.container {
  text-align: center;
  background: #ffffff;
  padding: 40px;
  border-radius: 8px;
  box-shadow: 0 4px 12px rgba(0,0,0,0.1);
}

h1 {
  margin-bottom: 20px;
  color: #333333;
}

p {
  color: #666666;
  margin-bottom: 30px;
  font-size: 18px;
}

.btn-join {
  display: inline-block;
  background: #0088cc;
  color: #ffffff;
  text-decoration: none;
  padding: 15px 30px;
  border-radius: 5px;
  font-size: 20px;
}

.btn-join:hover {
  background: #006699;
}