JSFiddle - React, Tailwind, and code Playground

HTML

<div class="parallax-wrapper" style="top: 100vh;">
  <div class="frame-top"></div>
  <section class="parallax-section part1">
    <div class="frame-bottom"></div>
    <div class="part1-sticky-container">
      <div class="part1-sticky">

      </div>
    </div>
  </section>

  <section class="parallax-section part2">
    <div class="part2-content">
      <h1 class="part2-text">
        Some text here
      </h1>
    </div>
  </section>
</div>

CSS

body {
	margin: 0;
}

.parallax-wrapper {
	top: 100vh;
}

.parallax-section {
	position: relative;
}

.part1 {
	background: url("https://place-hold.it/1920x1080") no-repeat;
	width: 100vw;
	height: 100vh;
	background-size: cover;

	z-index: 4;
}

.frame-bottom {
	position: sticky;
	z-index: 100;
	top: calc(100vh - 40px);
	height: 40px;
	width: 100%;
	background-color: #111;
}

.part2 {
	margin: 0;

	background: url("https://place-hold.it/1920x1080") no-repeat;
	background-size: 100vw;
	width: 100vw;
	height: 100vh;

	background-attachment: fixed;
	background-position: center;
	background-repeat: no-repeat;
	background-size: cover;

	z-index: 1;
}

.part2-content {
	position: sticky;
	width: 30rem;
	height: 5rem;
	z-index: 1;
	background-attachment: scroll;
	background-color: transparent;
	margin-left: calc(50% - 15rem);
	top: calc(50% - 2.5rem);
}

.part2-text {
	margin: 0;
	color: white;
	font-size: 32px;
	text-align: center;
}