.fancy {
  background-image: paint(headerHighlight);
}
h1 {
  --highColor: hsl(155 90% 60% / 0.7);
}
h3 {
  --highColor: hsl(255 90% 60% / 0.5);
}
h6 {
  --highColor: hsl(355 90% 60% / 0.3);
}