* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 140vh;
  font-family: Arial, sans-serif;
  color: #1f2937;
  background: #f7f7fb;
}

main {
  width: min(920px, calc(100% - 32px));
  margin: 40px auto 120px;
}

h1 {
  margin: 0 0 24px;
  font-size: 2rem;
}

section {
  margin-bottom: 40px;
}

.note {
  margin: 0 0 10px;
  font-size: 0.95rem;
  color: #4b5563;
}

/* This parent stays in normal flow and anchors the absolute child to itself. */
.relative-parent {
  position: relative;
  min-height: 260px;
  padding: 24px;
  border: 2px dashed #64748b;
  border-radius: 8px;
  background: #ffffff;
}

/* This child is anchored to its relative parent, so bottom-right stays inside it. */
.absolute-child {
  position: absolute;
  right: 16px;
  bottom: 16px;
  padding: 16px 18px;
  border-radius: 8px;
  color: #ffffff;
  background: #2563eb;
  font-weight: 700;
  box-shadow: 0 12px 24px rgba(37, 99, 235, 0.24);
}

/* This element is anchored to the viewport, so it remains bottom-left while the page scrolls. */
.fixed-corner {
  position: fixed;
  left: 18px;
  bottom: 18px;
  z-index: 10;
  padding: 14px 16px;
  border-radius: 8px;
  color: #ffffff;
  background: #047857;
  font-weight: 700;
  box-shadow: 0 12px 24px rgba(4, 120, 87, 0.25);
}

/* This container owns the scrolling area, giving the sticky item a boundary to stick within. */
.scroll-container {
  height: 340px;
  overflow-y: auto;
  border: 2px solid #cbd5e1;
  border-radius: 8px;
  background: #ffffff;
}

/* This header is anchored to the scroll container's top, so it sticks only while that container scrolls. */
.sticky-header {
  position: sticky;
  top: 0;
  z-index: 1;
  padding: 16px 20px;
  color: #111827;
  background: #facc15;
  font-weight: 700;
  border-bottom: 1px solid #eab308;
}

.scroll-content {
  padding: 18px 20px 28px;
}

.scroll-content p {
  margin: 0 0 18px;
  line-height: 1.6;
}