html,
body {
  height: 100%;
  background-color: #f1f1f1;
}

.cover-container {
  max-width: 42em;
}

/*
 * Cover
 */
.cover {
  padding: 0 1.5rem;
}
.cover .btn-lg {
  padding: .75rem 1.25rem;
  font-weight: 700;
}