<header class="header">
  <p>header</p>
</header>

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

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

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

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

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

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

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

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

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

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

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

.box,
.header {
  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;
}

.header {
  background-color: rgb(255 255 255 / .5);
  font-weight: 500;
  position: sticky;
  top: 0;
  z-index: 10;

  -webkit-backdrop-filter: blur(5px);
  backdrop-filter: blur(5px);
}