body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: #f6f8fa;
  color: #24292f;
  margin: 0;
}

.container {
  max-width: 640px;
  margin: 4rem auto;
  padding: 2rem;
  background: #fff;
  border: 1px solid #d0d7de;
  border-radius: 6px;
  text-align: center;
}

.avatar {
  border-radius: 50%;
}

.button {
  display: inline-block;
  padding: 0.6rem 1.2rem;
  background: #24292f;
  color: #fff;
  text-decoration: none;
  border-radius: 6px;
}