CSS Sticky Video

import styles from "./styles.module.css";

export default function CssStickyVideo({ heading, body, videoPlaceholder = "#1a1a1a" }) {
  return (
    <section className={styles.section}>
      <div className={styles.text}>
        <h2 className={styles.heading}>{heading}</h2>
        {body.map((para, i) => (
          <p key={i} className={styles.para}>{para}</p>
        ))}
      </div>
      <div
        className={styles.videoSticky}
        style={{ backgroundColor: videoPlaceholder }}
        aria-hidden="true"
      >
        <div className={styles.videoLabel}>Video</div>
      </div>
    </section>
  );
}

.section {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  padding: 4rem 3rem;
  max-width: 1100px;
  margin: 0 auto;
  align-items: start;
}

.text {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
  padding-top: 1rem;
}

.heading {
  font-size: 2rem;
  font-weight: 700;
  letter-spacing: -0.03em;
  color: #1a1a1a;
  line-height: 1.15;
}

.para {
  font-size: 0.9375rem;
  color: #6b6b6b;
  line-height: 1.7;
}

/* The key CSS: sticky positioned at calc(100vh - videoHeight - offset) */
.videoSticky {
  position: sticky;
  top: calc(100vh - 20vw - 172px);
  aspect-ratio: 4 / 3;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.videoLabel {
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.4);
}

@media (max-width: 768px) {
  .section {
    grid-template-columns: 1fr;
  }

  .videoSticky {
    position: relative;
    top: auto;
  }
}