body {
  background: #f8f8fc;
  font-family: Arial, sans-serif;
  text-align: center;
}
.container {
  padding: 50px;
}
.logo {
  width: 100px;
}
.btn {
  display: inline-block;
  padding: 12px 20px;
  margin: 10px;
  background-color: #4a90e2;
  color: white;
  text-decoration: none;
  border-radius: 6px;
}
.referral {
  margin-top: 40px;
}