<div class="container">
<div class="box sticky">
  <p>sticky header</p>
</div>

<div class="box">
  <p>item</p>
</div>

<div class="box">
  <p>item</p>
</div>

<div class="box">
  <p>item</p>
</div>

<div class="box">
  <p>item</p>
</div>

<div class="box">
  <p>item</p>
</div>

<div class="box">
  <p>item</p>
</div>

<div class="box">
  <p>item</p>
</div>

<div class="box">
  <p>item</p>
</div>

<div class="box">
  <p>item</p>
</div>

<div class="box">
  <p>item</p>
</div>

<div class="box">
  <p>item</p>
</div>
</div>

<div class="box">
<p>item</p>
</div>

<div class="box">
<p>item</p>
</div>

<div class="box">
<p>item</p>
</div>

<div class="box">
<p>item</p>
</div>

<div class="box">
<p>item</p>
</div>

<div class="box">
<p>item</p>
</div>

<div class="box">
<p>item</p>
</div>

<div class="box">
<p>item</p>
</div>
<div class="box">
<p>item</p>
</div>
<div class="box">
<p>item</p>
</div>
<div class="box">
<p>item</p>
</div>
<div class="box">
<p>item</p>
</div>
<div class="box">
<p>item</p>
</div>
<div class="box">
<p>item</p>
</div>

.container {
  border: 1px solid rgb(19 78 74 / 0.1);
}

.box {
  align-items: center;
  background-color: white;
  border-bottom: 1px solid rgb(19 78 74 / 0.1);
  color: rgb(55 65 81);
  display: flex;
  font-size: 0.75rem;
  justify-content: center;
}

.box.sticky {
  font-weight: 500;
  position: sticky;
  top: 0;
  z-index: 10;
}