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

.stage {
  box-sizing: border-box;
  min-height: 100vh;
  display: grid;
  place-items: center;
  margin: 0;
  background: #ffd23f;
  font-family: -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
  padding: clamp(8px, 4vw, 24px);
}

.totop {
  position: relative;
  width: 52px;
  height: 52px;
  border: 0;
  border-radius: 999px;
  background: #17141a;
  display: grid;
  place-items: center;
  overflow: hidden;
  box-shadow: 0 14px 24px rgba(23, 20, 26, 0.32);
  cursor: pointer;
}

.totop__arrow {
  width: 24px;
  height: 24px;
  fill: none;
  stroke: #ffd23f;
  stroke-width: 2.2;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.totop__arrow.is-demo {
  animation: arrow-bounce 1.4s ease-out infinite;
}

@keyframes arrow-bounce {
  0%, 100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-5px);
  }
}
@media (prefers-reduced-motion: reduce) {
  .totop__arrow.is-demo {
    animation: none;
  }
}