span.highlight-secondary {
  background: linear-gradient(180deg, transparent 55%, var(--primary) 55%, var(--primary) 85%, transparent 85%);
}
span.highlight-primary {
  background: linear-gradient(180deg, rgba(255, 255, 255, 0) 55%, #3a55e6 55%, #3a55e6 85%, rgba(255, 255, 255, 0) 85%);
}