body {
  margin: 0;
  padding: 0;
  background: #f7f7f7;
}

.stacking-wrapper {
  height: 300vh; /* Enough height to scroll */
  position: relative;
}

.stack-card {
  position: sticky;
  top: 0;
  transform: translateY(calc(var(--index) * 50px));
  z-index: calc(10 - var(--index));
  margin: 0 auto;
  width: 80%;
  padding: 40px;
  background: #fff;
  border-radius: 16px;
  box-shadow: 0 10px 30px rgba(0,0,0,0.1);
  height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
  transition: all 0.3s ease;
}