<section class="section">
<h1>content 1</h1>
</section>
<section class="section skyblue">
<h1>content 2</h1>
</section>
body {
margin: 0;
padding: 0;
}
.section {
display: grid;
place-items: center;
position: relative;
z-index: 2;
width: 100%;
aspect-ratio: 16 / 9;
}
.skyblue {
background: skyblue;
}