.error-page {
  max-width: 600px;
  margin: 100px auto;
  text-align: center;
}

.error-page h1 {
  font-size: 64px;
  margin-bottom: 20px;
}

.error-page p {
  margin-bottom: 30px;
  color: #555;
}

.btn-primary {
  display: inline-block;
  padding: 10px 18px;
  background: #222;
  color: #fff;
  text-decoration: none;
  border-radius: 6px;
}