html, body {
  margin: 0;
  overflow: hidden;
}

.stage {
  box-sizing: border-box;
  min-height: 100vh;
  display: grid;
  place-items: center;
  margin: 0;
  background: #ff4d1f;
  font-family: -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
  padding: clamp(8px, 4vw, 24px);
}

.stickypar {
  position: relative;
  width: 100%;
  height: 100%;
  overflow: hidden;
  display: grid;
  place-items: center;
}

.stickypar__bg {
  position: absolute;
  inset: -20% 0;
  background: repeating-linear-gradient(45deg, rgba(255, 247, 230, 0.22) 0 18px, transparent 18px 36px);
}
@supports (animation-timeline: scroll()) {
  .stickypar__bg {
    animation: bg-drift linear both;
    animation-timeline: scroll(root);
  }
}
@supports not (animation-timeline: scroll()) {
  .stickypar__bg {
    transform: none;
  }
}

.stickypar__caption {
  position: sticky;
  top: 40%;
  z-index: 1;
  margin: 0;
  padding: 12px 22px;
  border-radius: 999px;
  background: #17141a;
  color: #fff7e6;
  font: 700 clamp(14px, 4.4vw, 17px)/1 -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
}

@keyframes bg-drift {
  from {
    transform: translateY(0);
  }
  to {
    transform: translateY(-40px);
  }
}
.stage.is-demo .stickypar__bg {
  animation: bg-loop 2s ease-in-out infinite;
}

@keyframes bg-loop {
  0%, 100% {
    transform: translateY(40px);
  }
  50% {
    transform: translateY(-40px);
  }
}
@media (prefers-reduced-motion: reduce) {
  .stickypar__bg, .stage.is-demo .stickypar__bg {
    animation: none !important;
    transform: none;
  }
}