* { box-sizing: border-box; }
html, body { height: 100%; }

body{
  margin: 0;
  background: #fff;
}

.stage{
  min-height: 100svh;
  display: grid;
  place-items: center;
  padding: 48px 24px; /* 여백 넉넉하게 */
}

.mark{
  width: min(520px, 80vw); /* 화면에 맞게 자동 축소 */
  height: auto;
  display: block;
}