:root {
  --brand: #2563eb;
}

h1, h2, h3, h4 {
  color: var(--brand);
  font-weight: 700;
}

.active-nav {
  border-color: #0969da !important;
  color: #0969da !important;
}

nav a:hover {
  color: #24292f;
  border-color: #6e7781;
}