Back to CSS Split Screen Before/After Slider Light JS
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.ss-bef {
  display: grid; grid-template-columns: 50% 50%;
  min-height: 480px;
  font-family: 'Inter', system-ui, sans-serif;
  background: #fff;
  color: #2a2a2a;
  border-radius: 0; overflow: hidden;
}
.ss-bef-stage {
  position: relative;
  background: #f7f3ee;
  overflow: hidden;
  isolation: isolate;
  --reveal: 50%;
}
.ss-bef-stage:has(#ss-bef-r) {
  --reveal: calc(var(--ss-bef-pct, 50) * 1%);
}
.ss-bef-after, .ss-bef-before {
  position: absolute; inset: 0;
  display: flex; align-items: center; justify-content: center;
}
.ss-bef-after {
  background: linear-gradient(135deg, #ffe0e6 0%, #ffd0db 100%);
}
.ss-bef-before {
  background: linear-gradient(135deg, #efe2d4 0%, #d4c4ae 100%);
  clip-path: inset(0 0 0 var(--reveal));
}
.ss-bef-label {
  position: absolute; top: 18px;
  font-family: 'Inter', sans-serif;
  font-size: 10.5px; font-weight: 800;
  letter-spacing: 0.3em;
  padding: 5px 12px;
  background: rgba(255,255,255,0.92);
  color: #2a2a2a;
}
.ss-bef-after .ss-bef-label { right: 18px; color: #c41560; }
.ss-bef-before .ss-bef-label { left: 18px; color: #5a3825; }
.ss-bef-face {
  width: 200px; height: 240px;
  border-radius: 50% 50% 50% 50% / 60% 60% 40% 40%;
  position: relative;
}
.ss-bef-face-after {
  background: linear-gradient(180deg, #f8d4c8 0%, #e8b4a8 100%);
  box-shadow: 0 14px 40px rgba(196,21,96,0.18), inset -10px -20px 40px rgba(196,21,96,0.08);
}
.ss-bef-face-before {
  background: linear-gradient(180deg, #d8a888 0%, #c08868 100%);
  box-shadow: inset -10px -20px 40px rgba(0,0,0,0.18);
}
.ss-bef-face-before::before, .ss-bef-face-before::after {
  content: ''; position: absolute;
  background: rgba(196,90,28,0.4);
  border-radius: 50%;
}
.ss-bef-face-before::before { top: 30%; left: 25%; width: 12px; height: 12px; box-shadow: 14px 6px 0 -2px rgba(196,90,28,0.3), -8px 18px 0 -3px rgba(196,90,28,0.35), 26px 22px 0 -4px rgba(196,90,28,0.3); }
.ss-bef-face-before::after { top: 50%; right: 22%; width: 10px; height: 10px; box-shadow: -8px 6px 0 -2px rgba(196,90,28,0.3), 4px 14px 0 -3px rgba(196,90,28,0.4); }
.ss-bef-handle {
  position: absolute; top: 0; bottom: 0;
  left: var(--reveal);
  width: 2px;
  background: #fff;
  box-shadow: 0 0 0 1px rgba(0,0,0,0.1), 0 0 18px rgba(196,21,96,0.45);
  transform: translateX(-1px);
  pointer-events: none;
  z-index: 5;
}
.ss-bef-handle span:nth-child(1), .ss-bef-handle span:nth-child(2) {
  position: absolute; top: 50%; transform: translateY(-50%);
  width: 32px; height: 32px;
  background: #fff;
  border-radius: 50%;
  box-shadow: 0 4px 12px rgba(0,0,0,0.18);
}
.ss-bef-handle span:nth-child(1) { right: 18px; }
.ss-bef-handle span:nth-child(2) { left: 18px; }
.ss-bef-handle span:nth-child(1)::before, .ss-bef-handle span:nth-child(2)::before {
  content: ''; position: absolute; top: 50%; left: 50%;
  transform: translate(-50%, -50%);
  border: solid #c41560; border-width: 2px 2px 0 0;
  width: 8px; height: 8px;
}
.ss-bef-handle span:nth-child(1)::before { transform: translate(-25%, -50%) rotate(45deg); }
.ss-bef-handle span:nth-child(2)::before { transform: translate(-75%, -50%) rotate(-135deg); }
.ss-bef-content {
  padding: 44px 44px;
  display: flex; flex-direction: column; gap: 18px;
}
.ss-bef-eye {
  font-size: 11px; font-weight: 700;
  letter-spacing: 0.18em; text-transform: uppercase;
  color: #6a8a5a;
}
.ss-bef-content h2 {
  margin: 4px 0 0;
  font-family: 'Cormorant Garamond', serif;
  font-size: clamp(34px, 4.5vw, 52px);
  font-weight: 500;
  line-height: 0.96;
  letter-spacing: -0.02em;
  color: #2a2a2a;
}
.ss-bef-content h2 em {
  font-style: italic;
  color: #c41560;
}
.ss-bef-content p {
  margin: 0;
  font-size: 15px;
  line-height: 1.6;
  color: #5a5a5a;
  max-width: 420px;
}
.ss-bef-control {
  display: flex; flex-direction: column; gap: 8px;
  margin-top: 4px;
}
.ss-bef-control span {
  font-size: 11px; font-weight: 700;
  letter-spacing: 0.18em; text-transform: uppercase;
  color: #6a8a5a;
}
.ss-bef-control input[type="range"] {
  width: 100%;
  accent-color: #c41560;
}
.ss-bef-stats { list-style: none; margin: 0; padding: 14px 0; border-top: 1px solid #e0e0e0; border-bottom: 1px solid #e0e0e0; display: flex; gap: 22px; font-size: 13px; flex-wrap: wrap; }
.ss-bef-stats li { display: flex; flex-direction: column; gap: 2px; }
.ss-bef-stats strong {
  font-family: 'Cormorant Garamond', serif;
  font-size: 24px; font-weight: 500;
  color: #c41560;
  font-style: italic;
}
.ss-bef-cta {
  align-self: flex-start;
  padding: 14px 24px;
  background: #c41560;
  color: #fff;
  border: 0;
  border-radius: 28px;
  font-size: 13px; font-weight: 700;
  letter-spacing: 0.04em;
  cursor: pointer;
  box-shadow: 0 6px 18px rgba(196,21,96,0.3);
  transition: transform 0.12s, box-shadow 0.12s;
}
.ss-bef-cta:hover { transform: translateY(-1px); box-shadow: 0 10px 24px rgba(196,21,96,0.45); }
@media (max-width: 720px) {
  .ss-bef { grid-template-columns: 1fr; }
  .ss-bef-stage { min-height: 320px; }
}
<section class="ss-bef" aria-label="Before and after skincare result">
  <div class="ss-bef-stage" style="--reveal:50%;">
    <div class="ss-bef-after" aria-hidden="true">
      <span class="ss-bef-label">AFTER</span>
      <span class="ss-bef-face ss-bef-face-after"></span>
    </div>
    <div class="ss-bef-before" aria-hidden="true">
      <span class="ss-bef-label">BEFORE</span>
      <span class="ss-bef-face ss-bef-face-before"></span>
    </div>
    <span class="ss-bef-handle" aria-hidden="true">
      <span></span><span></span>
    </span>
  </div>
  <article class="ss-bef-content">
    <span class="ss-bef-eye">— Real client · 12 weeks</span>
    <h2>Quiet skin,<br/><em>loud confidence.</em></h2>
    <p>Drag the slider to see the result of our 12-week ritual: gentle exfoliation, daily SPF, and the Oat Renewal serum.</p>
    <label class="ss-bef-control">
      <span>Reveal</span>
      <input type="range" min="0" max="100" value="50" id="ss-bef-r" aria-label="Reveal amount" />
    </label>
    <ul class="ss-bef-stats">
      <li><strong>92%</strong> reduced redness</li>
      <li><strong>87%</strong> smoother texture</li>
      <li><strong>4.9★</strong> average rating</li>
    </ul>
    <button type="button" class="ss-bef-cta">Start the ritual →</button>
  </article>
</section>
/* Wire the range input to the CSS custom property so the slider drives
   the clip-path reveal. Pure CSS would be possible via :has() but value-
   reading from CSS isn't supported widely yet; this 5-line script is the
   reliable cross-browser path. */
(function () {
  var slider = document.getElementById('ss-bef-r');
  var stage  = slider && slider.closest('.ss-bef').querySelector('.ss-bef-stage');
  if (!slider || !stage) return;
  function sync() { stage.style.setProperty('--ss-bef-pct', slider.value); }
  slider.addEventListener('input', sync);
  sync();
})();
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