Smooth Sticky Section Reveal CSS (Code Snippet)

<div class="stack-wrapper">
  
  <section class="stack-section panel-1">
    <div class="panel-content">
      <h2>Section One</h2>
      <p>Scroll down. This section will stick to the top and the next panel will slide securely over it.</p>
    </div>
  </section>
  
  <section class="stack-section panel-2">
    <div class="panel-content">
      <h2>Section Two</h2>
      <p>Pure CSS positioning doing the heavy lifting.</p>
    </div>
  </section>
  
  <section class="stack-section panel-3">
    <div class="panel-content">
      <h2>Section Three</h2>
      <p>Beautiful, performant, and incredibly simple.</p>
    </div>
  </section>
  
</div>

*, *::before, *::after {
  box-sizing: border-box;
}

body {
  font-family: system-ui, "Segoe UI", Roboto, Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol";
  margin: 0;
  background: #0f172a;
}

.stack-wrapper {
  position: relative;
}

.stack-section {
  /* The core magic - each section sticks to the top of the viewport */
  position: sticky;
  top: 0;
  height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  box-shadow: 0 -20px 40px rgba(0, 0, 0, 0.3);
}

.panel-content {
  text-align: center;
  color: #ffffff;
  padding: 40px;
  max-width: 600px;
}

.panel-content h2 {
  font-size: 4rem;
  margin: 0 0 20px 0;
  letter-spacing: -2px;
}

.panel-content p {
  font-size: 1.25rem;
  color: #cbd5e1;
  line-height: 1.6;
}

.panel-1 {
  background: #0f172a;
}

.panel-2 {
  background: #1e293b;
}

.panel-3 {
  background: #334155;
}

Smooth Sticky Section Reveal CSS

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