:root {
  --cave: #0a0d0a;
  --moss: #2a3520;
}

.chapter-header {
  background:
    radial-gradient(ellipse 100% 60% at 50% 100%, #2e5220 0%, transparent 65%),
    radial-gradient(ellipse 60% 40% at 20% 50%, #385e28 0%, transparent 60%),
    #1e3018;
}

.chapter-header::after {
  background: radial-gradient(ellipse 80% 100% at 50% 0%, transparent 40%, rgba(8,10,6,0.45) 100%);
}